using System;
using System.Linq;

class Program
{
    static void Main()
    {
        var i = Console.ReadLine().Split().Select(int.Parse).ToArray();
        var bitInt = (i[0] | i[1]);
        var ans = Factorial(bitInt);
        Console.WriteLine(ans);
    }
    public static long Factorial(int n)
    {
        if (n == 0)
        {
            return 1L;
        }
        else
        {
            return n * Factorial(n - 1);
        }
    }
}