using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Threading;

namespace parallelInvok
{
    class Program
    {
        static void Main()
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            try
            {
                Parallel.Invoke(
                    Sum,
                    () =>
                    {
                        Console.WriteLine("Method=beta, Thread={0}", Thread.CurrentThread.ManagedThreadId);
                    },
                    delegate ()
                    {
                        Console.WriteLine("Method=gamma, Thread={0}", Thread.CurrentThread.ManagedThreadId);
                    }
                );
            }
            catch (AggregateException e)
            {
                Console.WriteLine("error");
            }
            sw.Stop();

            Console.WriteLine("Time: " + sw.ElapsedMilliseconds / 100.0);
        }

        static void Sum()
        {
            int N;
            Console.WriteLine("Введите N:");
            N = Convert.ToInt32(Console.ReadLine());
            double res = 0;
            for (double i = 0; i < N; i++)
                res += i / (i * i + 1);
            Console.WriteLine(res);
        }
    }
}