static void Main(string[] args)
{
ISubject subject = new Subject();
var third = new Classes.Observer("Third");
subject.RegisterObserver(new Classes.Observer("First"));
subject.RegisterObserver(new Classes.Observer("Second"));
subject.RegisterObserver(third);
subject.SetState(100, 20, 30);
subject.RemoveObserver(third);
subject.SetState(50, 3, 17);
Console.ReadKey();
}