// The factoral function in continuation-passing style, in Java
// sestoft@dina.kvl.dk 2002-04-03

interface Cont {
  void k(int v);
}

class Factorial {
  public static void main(String[] args) {
    int n = Integer.parseInt(args[0]);
    facc(n, 
	 new Cont() {
	     public void k(int v) {
	       System.out.println(v);
	     }
	   });
  }

  static void facc(final int n, final Cont cont) {
    if (n == 0) 
      cont.k(1);
    else
      facc(n-1, 
	   new Cont() {
	       public void k(int v) {
		 cont.k(n * v);
	       }
	     });
  }
}