static void Main(string[] args)
        {
            Ex1_1 ex = new Ex1_1();

            ex.run(rand);
            ex.show();
        }
        static void Main(string[] args)
        {
            Ex1_1 ex = new Ex1_1();

            ex.run(rand);
            ex.show();
            Console.WriteLine("Press any key to continue...");
            Console.ReadKey();
        }