using System;

class Program
{
    static void Main(string[] args)
    {
        var line = Console.ReadLine();

        string[] strLine = line.ToString().Split(" ");

        int trick = int.Parse(strLine[0]);
        int treat = int.Parse(strLine[1]);

        Ans(trick, treat);
    }

    static void Ans(int trick, int treat)
    {
        int trickORtreat = trick | treat;

        string strBit = Convert.ToString(trickORtreat, 2);
        long intNum = Convert.ToInt64(strBit, 2);
        long ansNum = 1;

        for (long i = 1; i <= intNum; i++)
        {
            ansNum *= i;
        }

        Console.WriteLine($"{ansNum}");
    }
}