using System;

using System.Threading;

​

public class Program

{

    static int Total = 0;

    public static void Main()

    {

        Thread T1 = new Thread(Program.AddOnemillion);

        Thread T2 = new Thread(Program.AddOnemillion);

        Thread T3 = new Thread(Program.AddOnemillion);

        T1.Start();

        T2.Start();

        T3.Start();

        T1.Join();

        T2.Join();

        T3.Join();

        Console.WriteLine("Total = "+ Total);

    }

    public static void AddOnemillion()

    {

        for(int i = 0; i <= 1000000; i++)

        {

            Interlocked.Increment(ref Total);

        }

    }   

}