using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var input = Console.ReadLine().Split().Select(int.Parse).ToArray();
        var temp = input[0] | Kaijou(input[1]);
        var ans = Kaijou(temp);
        Console.WriteLine(ans);
    }

    static int Kaijou(int n)
    {
        if (n == 1) return 1;
        return n * Kaijou(n - 1);
    }
}