static byte[] tab;
        static int result;
        static Thread t1, t2;

        static void Main(string[] args)
        {
            result = 0;
            Random rand = new Random();
            tab = new byte[1000];
            for (int i = 0; i < 1000; i++)
                tab[i] = (byte)rand.Next(0, 10);
            t1 = new Thread(add);
            t2 = new Thread(add);
            t1.Start(0);
            t2.Start(500);
            t2.Join();
            Console.WriteLine(result);
            Console.ReadKey();
        }

        static void add(object o)
        {
            int tmp = 0;
            int start = (int)o;
            int result=0;
            for(int i=start;i<start+500;i++)
                tmp +=tab[i];
            if (start == 500)
                t1.Join();
            result += tmp;
        }