public class Appels {
	
	public Appels(int val) {
		int indentation = 0;
		fact(val, indentation);
	}

	public int fact(int nb, int indentation) {
		if(nb > 0) {
			System.out.println("	");
			return nb*fact(nb-1,indentation++);
		} else {
			Thread.dumpStack();
			return 1;
		}
		System.out.println(nb+"! = "+fact(nb, indentation));

	}

	public static void main(String[] args) {
		new Appels(Integer.parseInt(args[0])); 
	}
}