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  __block int num = 0;
  RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id  subscriber) {
      num++;
      NSLog(@"Increment num to: %i",num);
      [subscriber sendNext:@(num)];
      return nil;
  }] replay];
 
  NSLog"Start subscriptions");
 
  // Subscriber 1 (S1)
  [signal subscribeNext:^id x{
      NSLog"S1: %@",x);
  ];
 
  // Subscriber 2 (S2)
  "S2: %@",10)">// Subscriber 3 (S3)
  "S3: %@",0)">];