using System;

namespace _08FactorialDivision
{
    class Program
    {
        static void Main(string[] args)
        {
            decimal firstNumber = decimal.Parse(Console.ReadLine());
            decimal secondNumber = decimal.Parse(Console.ReadLine());

            decimal division = Fact(firstNumber) / Fact(secondNumber);

            Console.WriteLine($"{division:F2}");
        }

        static decimal Fact(decimal num)
        {
            if (num == 1)
            {
                return 1;
            }
            else
            {
                return num * Fact(num - 1);
            }
        }
    }
}