class Program
{
    static void Main(string[] args)
    {
        string[] input = Console.ReadLine()!.Split(' ');
        int leftNum = int.Parse(input[0]);
        int rightNum = int.Parse(input[1]);
        int or = leftNum | rightNum;

        decimal ans = 1;
        for (int i = 1; i <= or; i++)
        {
            ans *= i;
        }

        Console.WriteLine(ans);
    }
}