using System;

namespace Introduction.MoreMath
{
	class Program
	{
		static void Main(string[] args)
		{
			double functionResult;
			int a;
			double x;
			Console.WriteLine("Įveskite a reikšmę:");
			a = int.Parse(Console.ReadLine());
			Console.WriteLine("Įveskite x reikšmę:");
			x = double.Parse(Console.ReadLine());
			if (x <= 0)
				functionResult = a * Math.Exp(-x);
			else
				if (x < 1)
					functionResult = 5 * a * x - 7;
			else
				functionResult = Math.Pow(x + 1, 0.5);
			Console.WriteLine(" Reikšmė a = {0}, reikšmė x = {1}, fx = {2}", a, x, functionResult);
			Console.ReadKey();
		}
	}
}