class Alpha {
  public static void main(String[] args) {
    Beta f = new Beta(3);
  }
  Alpha() {
    System.out.println(0);
  }
  Alpha(int i) {
    System.out.println(i);
  }
}
class Beta extends Alpha {
  Beta() {
    super(6);
  }
  Beta(int i) {
    super(3);
    this();
  }
}