package com.example;

import java.util.Scanner;

/**
 * Hello world!
 *
 */
public class App {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        int c = a | b;
        long d = 1;
        for (int i = 1; i <= c; i ++) {
            d *= i;
        };
        System.out.println(d);
        sc.close();
    }
}