package method;

public class Demo6 {
    //2!  2*1
    //3! 3*2*1
    public static void main(String[] args) {
        System.out.println(f(5));

    }
//1!  1
    //5!   5*4*3*2*1
    public static int f(int n){
        if(n==1) {
            return 1;
        }else{
            return  n*f(n-1);
        }
    }
}