package cn.edu.bjut.chapter3;

public class Factorial {
	static int calculate(int n) {
		if (n == 0) {
			return 1;
		} else {
			return (n * calculate(n - 1));
		}
	}

	public static void main(String[] args) {
		int n = 5;
		System.out.println(n + "! = " + calculate(n));
	}
}