import java.util.Scanner;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("enter");
        int num = Integer.parseInt(in.nextLine());

        long sum = 1;
        for(int i = num; i != 0; i--) {
            sum *= i;
        }
        System.out.println("Result: " + sum);
        System.out.println("Method: " + method(num));
    }

    public static long method(int i) {
        if(i == 1) return i;
        return i * method(--i);
    }
}