diff --git a/L3/LD_24/App_Data/Rezultatai.txt b/L3/LD_24/App_Data/Rezultatai.txt
index 288d333..c501991 100644
--- a/L3/LD_24/App_Data/Rezultatai.txt
+++ b/L3/LD_24/App_Data/Rezultatai.txt
@@ -1,45 +1,45 @@
 ----------------------------
 | Įtaisai                  |
 ----------------------------
-| ID |     Vardas | Kaina  |
+| ID | Vardas     |  Kaina |
 ----------------------------
-|  0 | Atsuktuvas | 0.99   |
-|  1 |    Varztas | 0.05   |
-|  2 |     Laidas | 2.00   |
-|  3 |  Plaktukas | 2.99   |
+| 0  | Atsuktuvas |   0.99 |
+| 1  | Varztas    |   0.05 |
+| 2  | Laidas     |   2.00 |
+| 3  | Plaktukas  |   2.99 |
 ----------------------------
 
 --------------------------------------------------
 | Pirkėjai                                       |
 --------------------------------------------------
-|   Pavardė | Vardas | Įtaisas  | Įtaiso kiekis  |
+| Pavardė   | Vardas |  Įtaisas |  Įtaiso kiekis |
 --------------------------------------------------
-| Petraitis | Petras | 0        | 10             |
-| Petraitis | Petras | 1        | 10             |
-|  Jonaitis |  Jonas | 1        | 20             |
-|  Jonaitis |  Jonas | 1        | 20             |
-|  Jonaitis |  Jonas | 1        | 20             |
-|    Onaite |    Ona | 2        | 200            |
-|  Jonaitis | Brolis | 1        | 100            |
-|  Jonaitis | Brolis | 0        | 100            |
-|  Jonaitis |  Jonas | 1        | 20             |
-|  Jonaitis |  Jonas | 1        | 20             |
-|  Jonaitis |  Jonas | 2        | 20             |
-|    Onaite |    Ona | 0        | 20             |
+| Petraitis | Petras |        0 |             10 |
+| Petraitis | Petras |        1 |             10 |
+| Jonaitis  | Jonas  |        1 |             20 |
+| Jonaitis  | Jonas  |        1 |             20 |
+| Jonaitis  | Jonas  |        1 |             20 |
+| Onaite    | Ona    |        2 |            200 |
+| Jonaitis  | Brolis |        1 |            100 |
+| Jonaitis  | Brolis |        0 |            100 |
+| Jonaitis  | Jonas  |        1 |             20 |
+| Jonaitis  | Jonas  |        1 |             20 |
+| Jonaitis  | Jonas  |        2 |             20 |
+| Onaite    | Ona    |        0 |             20 |
 --------------------------------------------------
 
 ------------------------------------------------------------
 | Populiariausi įtaisai                                    |
 ------------------------------------------------------------
-| ID | Vardas | Įtaisų kiekis, vnt.  | Įtaisų kaina, eur.  |
+| ID | Vardas |  Įtaisų kiekis, vnt. |  Įtaisų kaina, eur. |
 ------------------------------------------------------------
-|  2 | Laidas | 220                  | 440.00              |
+| 2  | Laidas |                  220 |              440.00 |
 ------------------------------------------------------------
 
 ----------------------------------------------------------
 | Vienos rūšies pirkėjai                                 |
 ----------------------------------------------------------
-| Pavardė | Vardas | Įtaiso kiekis, vnt.  | Kaina, eur.  |
+| Pavardė | Vardas |  Įtaiso kiekis, vnt. |  Kaina, eur. |
 ----------------------------------------------------------
 | Nėra                                                   |
 ----------------------------------------------------------
@@ -47,9 +47,9 @@
 ----------------------------------
 | Atrinkti įtaisai (n=1, k=1.00) |
 ----------------------------------
-| ID |     Vardas | Kaina        |
+| ID | Vardas     |        Kaina |
 ----------------------------------
-|  0 | Atsuktuvas | 0.99         |
-|  1 |    Varztas | 0.05         |
+| 0  | Atsuktuvas |         0.99 |
+| 1  | Varztas    |         0.05 |
 ----------------------------------
 
diff --git a/L3/LD_24/Code/InOutUtils.cs b/L3/LD_24/Code/InOutUtils.cs
index df1d0b3..f8bda0a 100644
--- a/L3/LD_24/Code/InOutUtils.cs
+++ b/L3/LD_24/Code/InOutUtils.cs
@@ -14,31 +14,28 @@ namespace LD_24.Code
     public static class InOutUtils
     {
         /// <summary>
-        /// Read lines from a file
+        /// Read lines from a stream
         /// </summary>
         /// <param name="filename">Target filename</param>
         /// <returns>IEnumerable of all the lines</returns>
-        private static IEnumerable<string> ReadLines(string filename)
+        private static IEnumerable<string> ReadLines(StreamReader stream)
         {
-            using (StreamReader reader = File.OpenText(filename))
+            string line;
+            while ((line = stream.ReadLine()) != null)
             {
-                string line;
-                while ((line = reader.ReadLine()) != null)
-                {
-                    yield return line;
-                }
+                yield return line;
             }
         }
 
         /// <summary>
-        /// Read products from a file
+        /// Read products from a stream reader
         /// </summary>
-        /// <param name="filename">Target file</param>
+        /// <param name="reader">Target stream reader</param>
         /// <returns>A list of products</returns>
-        public static LinkedList<Product> ReadProducts(string filename)
+        public static LinkedList<Product> ReadProducts(StreamReader reader)
         {
             LinkedList<Product> products = new LinkedList<Product>();
-            foreach (string line in ReadLines(filename))
+            foreach (string line in ReadLines(reader))
             {
                 string[] parts = line.Split(',');
                 string id = parts[0].Trim();
@@ -49,15 +46,67 @@ namespace LD_24.Code
             return products;
         }
 
+        /// <summary>
+        /// Read products from a stream
+        /// </summary>
+        /// <param name="stream">Target stream</param>
+        /// <returns>A list of products</returns>
+        public static LinkedList<Product> ReadProducts(Stream stream)
+        {
+            using (StreamReader reader = new StreamReader(stream))
+            {
+                return ReadProducts(reader);
+            }
+        }
+
+        /// <summary>
+        /// Read products from a file
+        /// </summary>
+        /// <param name="filename">Target file</param>
+        /// <returns>A list of products</returns>
+        public static LinkedList<Product> ReadProducts(string filename)
+        {
+            using (StreamReader reader = File.OpenText(filename))
+            {
+                return ReadProducts(reader);
+            }
+        }
+
         /// <summary>
         /// Read orders from a file
         /// </summary>
         /// <param name="filename">Target file</param>
         /// <returns>A list of orders</returns>
         public static LinkedList<Order> ReadOrders(string filename)
+        {
+            using (StreamReader reader = File.OpenText(filename))
+            {
+                return ReadOrders(reader);
+            }
+        }
+
+        /// <summary>
+        /// Read orders from a stream
+        /// </summary>
+        /// <param name="stream">Target stream</param>
+        /// <returns>A list of orders</returns>
+        public static LinkedList<Order> ReadOrders(Stream stream)
+        {
+            using (StreamReader reader = new StreamReader(stream))
+            {
+                return ReadOrders(reader);
+            }
+        }
+
+        /// <summary>
+        /// Read orders from a stream reader
+        /// </summary>
+        /// <param name="reader">Target stream reader</param>
+        /// <returns>A list of orders</returns>
+        public static LinkedList<Order> ReadOrders(StreamReader reader)
         {
             LinkedList<Order> orders = new LinkedList<Order>();
-            foreach (string line in ReadLines(filename))
+            foreach (string line in ReadLines(reader))
             {
                 string[] parts = line.Split(',');
                 string customerSurname = parts[0].Trim();
@@ -79,10 +128,10 @@ namespace LD_24.Code
         {
             for (int i = 0; i < widths.Count; i++)
             {
-                if (widths[i] < 0)
-                    writer.Write("| {0} ", cells[i].PadRight(-widths[i]));
+                if (widths[i] > 0)
+                    writer.Write("| {0} ", cells[i].PadRight(widths[i]));
                 else
-                    writer.Write("| {0} ", cells[i].PadLeft(widths[i]));
+                    writer.Write("| {0} ", cells[i].PadLeft(-widths[i]));
             }
             writer.WriteLine("|");
         }
diff --git a/L3/LD_24/Code/LinkedList.cs b/L3/LD_24/Code/LinkedList.cs
index 4a389d5..bbe51b4 100644
--- a/L3/LD_24/Code/LinkedList.cs
+++ b/L3/LD_24/Code/LinkedList.cs
@@ -42,10 +42,8 @@ namespace LD_24.Code
         public int Count()
         {
             int count = 0;
-            Node current = head;
-            while (current != null)
+            for (Node d = head; d != null; d = d.Next)
             {
-                current = current.Next;
                 count++;
             }
             return count;
diff --git a/L3/LD_24/Forma1.aspx b/L3/LD_24/Forma1.aspx
index 6aefcdf..3c6686c 100644
--- a/L3/LD_24/Forma1.aspx
+++ b/L3/LD_24/Forma1.aspx
@@ -10,15 +10,27 @@
     <form id="form1" runat="server">
         
         <asp:ValidationSummary ID="ValidationSummary1" runat="server" ForeColor="Red" />
+        <asp:Label ID="Label9" runat="server" Text="Produktai:"></asp:Label>
+        <br />
+        <asp:FileUpload ID="FileUpload1" runat="server" />
+        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="FileUpload1" Display="Dynamic" ErrorMessage="Privaloma nurodyti produktus" ForeColor="Red"></asp:RequiredFieldValidator>
+        <br />
+        <asp:Label ID="Label10" runat="server" Text="Pirkėjai:"></asp:Label>
+        <br />
+        <asp:FileUpload ID="FileUpload2" runat="server" />
+        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="FileUpload2" Display="Dynamic" ErrorMessage="Privaloma nurodyti pirkėjus" ForeColor="Red"></asp:RequiredFieldValidator>
+        <br />
         <asp:Label ID="Label5" runat="server" Text="n:"></asp:Label>
         <br />
         <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
-        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="Tiktais teigiami sveiki skaičiai yra galimi" ForeColor="Red" ValidationExpression="\d+"></asp:RegularExpressionValidator>
+        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="&quot;n&quot; gali būti tiktais teigiamas sveikas skaičius" ForeColor="Red" ValidationExpression="\d+" Display="Dynamic"></asp:RegularExpressionValidator>
+        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="TextBox1" Display="Dynamic" ErrorMessage="Privaloma nurodyti &quot;n&quot;" ForeColor="Red"></asp:RequiredFieldValidator>
         <br />
         <asp:Label ID="Label6" runat="server" Text="k:"></asp:Label>
         <br />
         <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
-        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="TextBox2" ErrorMessage="Tiktais teigiami skaičiai yra galimi" ForeColor="Red" ValidationExpression="\d+(\.\d+)?"></asp:RegularExpressionValidator>
+        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="TextBox2" ErrorMessage="&quot;k&quot; gali būti tiktais teigiamas sveikas skaičius" ForeColor="Red" ValidationExpression="\d+(\.\d+)?" Display="Dynamic"></asp:RegularExpressionValidator>
+        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox2" Display="Dynamic" ErrorMessage="Privaloma nurodyti &quot;k&quot;" ForeColor="Red"></asp:RequiredFieldValidator>
         <br />
         <br />
         <asp:Button ID="Button1" runat="server" Text="Atrinkti" OnClick="Button1_Click" />
diff --git a/L3/LD_24/Forma1.aspx.cs b/L3/LD_24/Forma1.aspx.cs
index cdb7ab7..dc973c5 100644
--- a/L3/LD_24/Forma1.aspx.cs
+++ b/L3/LD_24/Forma1.aspx.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Web;
@@ -14,8 +15,6 @@ namespace LD_24
     /// </summary>
     public partial class Forma1 : System.Web.UI.Page
     {
-        private const string inputFileA = "App_Data/U24a.txt";
-        private const string inputFileB = "App_Data/U24b.txt";
         private const string outputFilename = "App_Data/Rezultatai.txt";
 
         protected void Page_Load(object sender, EventArgs e)
@@ -30,8 +29,8 @@ namespace LD_24
 
             FindControl("ResultsDiv").Visible = true;
 
-            var products = InOutUtils.ReadProducts(Server.MapPath(inputFileA));
-            var orders = InOutUtils.ReadOrders(Server.MapPath(inputFileB));
+            var products = InOutUtils.ReadProducts(FileUpload1.FileContent);
+            var orders = InOutUtils.ReadOrders(FileUpload2.FileContent);
 
             List<string> mostPopularProductIds = TaskUtils.FindMostPopularProducts(orders);
             var mostPopularProducts = TaskUtils.FindByID(products, mostPopularProductIds);
@@ -54,5 +53,6 @@ namespace LD_24
                 InOutUtils.PrintProducts(writer, filteredProducts, $"Atrinkti įtaisai (n={n}, k={k:f2})");
             }
         }
+
     }
 }
\ No newline at end of file
diff --git a/L3/LD_24/Forma1.aspx.designer.cs b/L3/LD_24/Forma1.aspx.designer.cs
index 691f56f..ceb44c0 100644
--- a/L3/LD_24/Forma1.aspx.designer.cs
+++ b/L3/LD_24/Forma1.aspx.designer.cs
@@ -7,11 +7,13 @@
 // </auto-generated>
 //------------------------------------------------------------------------------
 
-namespace LD_24 {
-    
-    
-    public partial class Forma1 {
-        
+namespace LD_24
+{
+
+
+    public partial class Forma1
+    {
+
         /// <summary>
         /// form1 control.
         /// </summary>
@@ -20,7 +22,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.HtmlControls.HtmlForm form1;
-        
+
         /// <summary>
         /// ValidationSummary1 control.
         /// </summary>
@@ -29,7 +31,61 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.ValidationSummary ValidationSummary1;
-        
+
+        /// <summary>
+        /// Label9 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.Label Label9;
+
+        /// <summary>
+        /// FileUpload1 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.FileUpload FileUpload1;
+
+        /// <summary>
+        /// RequiredFieldValidator1 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
+
+        /// <summary>
+        /// Label10 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.Label Label10;
+
+        /// <summary>
+        /// FileUpload2 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.FileUpload FileUpload2;
+
+        /// <summary>
+        /// RequiredFieldValidator2 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2;
+
         /// <summary>
         /// Label5 control.
         /// </summary>
@@ -38,7 +94,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label5;
-        
+
         /// <summary>
         /// TextBox1 control.
         /// </summary>
@@ -47,7 +103,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.TextBox TextBox1;
-        
+
         /// <summary>
         /// RegularExpressionValidator1 control.
         /// </summary>
@@ -56,7 +112,16 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidator1;
-        
+
+        /// <summary>
+        /// RequiredFieldValidator3 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator3;
+
         /// <summary>
         /// Label6 control.
         /// </summary>
@@ -65,7 +130,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label6;
-        
+
         /// <summary>
         /// TextBox2 control.
         /// </summary>
@@ -74,7 +139,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.TextBox TextBox2;
-        
+
         /// <summary>
         /// RegularExpressionValidator2 control.
         /// </summary>
@@ -83,7 +148,16 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.RegularExpressionValidator RegularExpressionValidator2;
-        
+
+        /// <summary>
+        /// RequiredFieldValidator4 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator4;
+
         /// <summary>
         /// Button1 control.
         /// </summary>
@@ -92,7 +166,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Button Button1;
-        
+
         /// <summary>
         /// ResultsDiv control.
         /// </summary>
@@ -101,7 +175,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.HtmlControls.HtmlGenericControl ResultsDiv;
-        
+
         /// <summary>
         /// Label1 control.
         /// </summary>
@@ -110,7 +184,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label1;
-        
+
         /// <summary>
         /// Table1 control.
         /// </summary>
@@ -119,7 +193,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Table Table1;
-        
+
         /// <summary>
         /// Label2 control.
         /// </summary>
@@ -128,7 +202,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label2;
-        
+
         /// <summary>
         /// Table2 control.
         /// </summary>
@@ -137,7 +211,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Table Table2;
-        
+
         /// <summary>
         /// Label8 control.
         /// </summary>
@@ -146,7 +220,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label8;
-        
+
         /// <summary>
         /// Table5 control.
         /// </summary>
@@ -155,7 +229,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Table Table5;
-        
+
         /// <summary>
         /// Label4 control.
         /// </summary>
@@ -164,7 +238,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label4;
-        
+
         /// <summary>
         /// Table3 control.
         /// </summary>
@@ -173,7 +247,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Table Table3;
-        
+
         /// <summary>
         /// Label7 control.
         /// </summary>
@@ -182,7 +256,7 @@ namespace LD_24 {
         /// To modify move field declaration from designer file to code-behind file.
         /// </remarks>
         protected global::System.Web.UI.WebControls.Label Label7;
-        
+
         /// <summary>
         /// Table4 control.
         /// </summary>
diff --git a/L3/LD_24/packages.config b/L3/LD_24/packages.config
index 5432864..d6710b5 100644
--- a/L3/LD_24/packages.config
+++ b/L3/LD_24/packages.config
@@ -1,14 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="FluentAssertions" version="6.5.1" targetFramework="net461" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net461" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.5.0" targetFramework="net461" />
   <package id="System.Threading.Tasks.Extensions" version="4.5.0" targetFramework="net461" />
-  <package id="xunit" version="2.4.1" targetFramework="net461" />
-  <package id="xunit.abstractions" version="2.0.3" targetFramework="net461" />
-  <package id="xunit.analyzers" version="0.10.0" targetFramework="net461" />
-  <package id="xunit.assert" version="2.4.1" targetFramework="net461" />
-  <package id="xunit.core" version="2.4.1" targetFramework="net461" />
-  <package id="xunit.extensibility.core" version="2.4.1" targetFramework="net461" />
-  <package id="xunit.extensibility.execution" version="2.4.1" targetFramework="net461" />
 </packages>
\ No newline at end of file