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);
	}
}