using System;

using System.Collections.Generic;

using System.Threading.Tasks;

public class Program

{

     private static int sum = 0;

​

     public static void Main()

     {

         List<Task> tasks = new List<Task>();

         for (var a = 0; a <= 100; a++)

         {

             tasks.Add(Task.Factory.StartNew(Act));

         }

         Task.WaitAll(tasks.ToArray());

         Console.WriteLine(sum);

     }

​

     private static void Act()

     {

         for (var a = 0; a <= 10000; a++)

         {

             sum++;

         }

     }

}