static bool Equal(int[] a, int num)
        {
            bool flag = false;
            int counter=0;
            for (int i = 0; i < a.Length; i++)
            {
                if (num == a[i])
                    counter++;
            }
            if (counter > 0)
                flag = true;
            if (counter == 0)
                flag = false;
            return flag;
        }