static void Main(string[] args)
        {
            var cup = new Cup();

            while (true)
            {
                var answer = MainMenu();
                switch (answer)
                {
                case 1:
                    Console.WriteLine(cup.Roll());
                    break;

                case 2:
                    DieMenu(cup);
                    break;

                case 3:
                    cup.Empty();
                    break;
                }
            }
        }