using System;

namespace ConsoleApplication6
{
    internal class Program
    {
        private static void Main()
        {
            int iters = 100;
            double a = 0;
            for (int q = 0; q < iters; q++)
                for (int i = 0; i < 1000000; i++)
                    if (i%2 == 0) a += Math.Sin(i); else a -= Math.Sin(i);
            Console.WriteLine(a);
        }
    }
}