static void Main(string[] args)
        {
            var customTimer = new CustomTimer();
            var watcher     = new Watcher();
            var inspector   = new Inspector(customTimer);

            watcher.Register(customTimer);

            string secondsString = "";
            int    seconds;

            Console.WriteLine("Set timer:");
            secondsString = Console.ReadLine();
            while (secondsString != "-1")
            {
                if (Int32.TryParse(secondsString, out seconds) && seconds > -1)
                {
                    Console.WriteLine("Start timer to {0} seconds.", seconds);
                    Thread.Sleep(seconds * 1000);
                    customTimer.SimulateEndTimer(seconds);
                }
                else
                {
                    Console.WriteLine("You set incorrect value of seconds.");
                }
                Console.WriteLine();
                Console.WriteLine("Set timer (-1 for end of programm):");
                secondsString = Console.ReadLine();
            }

            //watcher.Unregister(customTimer);
            //Console.WriteLine();
            //Console.WriteLine("Start timer in 5 seconds.");
            //Thread.Sleep(5 * 1000);
            //customTimer.SimulateEndTimer(5);
            //Console.ReadKey();
        }