diff --git a/1.py b/1.py
new file mode 100644
index 0000000..cd49373
--- /dev/null
+++ b/1.py
@@ -0,0 +1,7 @@
+sum = 0
+
+for i in range(1000):
+    if (i % 3 == 0 or i % 5 == 0):
+        sum += i
+
+print(sum)
diff --git a/2.py b/2.py
new file mode 100644
index 0000000..7ebcd29
--- /dev/null
+++ b/2.py
@@ -0,0 +1,17 @@
+sum = 0
+memo = [1,2]
+while True:
+    i = len(memo)
+    a = memo[i-1]
+    b = memo[i-2]
+    if a+b > 4000000:
+        break
+    memo.append(a+b)
+
+
+for i in memo:
+    if (i % 2 == 0):
+        sum += i
+
+
+print(sum)
diff --git a/3.py b/3.py
new file mode 100644
index 0000000..8607e92
--- /dev/null
+++ b/3.py
@@ -0,0 +1,22 @@
+import math
+
+def maxPrimeFactors (n):
+	maxPrime = -1
+
+	while n % 2 == 0:
+		maxPrime = 2
+		n /= 2
+
+	for i in range(3, int(math.sqrt(n)) + 1, 2):
+		while n % i == 0:
+			maxPrime = i
+			n = n / i
+	if n > 2:
+		maxPrime = n
+
+	return int(maxPrime)
+
+
+
+n = 600851475143
+print(maxPrimeFactors(n))