using Templates.Observer;
class Client {

  public static void Main(){
     Subject subj = new Subject();
     Observer o1 = new Observer(),
              o2 = new Observer(),
              o3 = new Observer();

     subj.AddNotifier(o1.Update);   
     subj.AddNotifier(o2.Update);   
                                    
     subj.Notify();    
  }
}