Untitled

using System;
using System.Threading;

class Program
{
    static void Main(string[] args)
    {
        long sum1 = 0, sum2 = 0;
        AutoResetEvent t1Event = new AutoResetEvent(false);
        AutoResetEvent t2Event = new AutoResetEvent(false);
        Thread t1 = new Thread(() =>
        {
            for (int i = 1; i <= 1000; i++)
            {
                sum1 += i * i;
            }
            t1Event.Set();
        });
        Thread t2 = new Thread(() =>
        {
            for (int i = 1001; i <= 2000; i++)
            {
                sum2 += i * i;
            }
            t2Event.Set();
        });
        t1.Start();
        t2.Start();
        t1Event.WaitOne();
        t2Event.WaitOne();
        Console.WriteLine("Sum 1: " + sum1);
        Console.WriteLine("Sum 2: " + sum2);
        Console.ReadKey();
    }
}