using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Test_1
{
    class Program
    {
        static void Main(string[] args)
        {
            Double x;
            Console.WriteLine("Podaj liczbę: ");
            x = Double.Parse(Console.ReadLine());
            Console.WriteLine("cos x wynosi: ");
            Console.WriteLine(Math.Cos(x));
            Console.ReadLine();
        }
    }
}