Factorial Division

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ExtraExercise_TopInteger
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int divider = int.Parse(Console.ReadLine());

            double result = DivisibleFactorial(n, divider);
            Console.WriteLine($"{result:f2}");

        }

        private static int DivisibleFactorial(int n, int divider)
        {
            int n1 = n;
            int sum = 0;

            while (n1 != 0)
            {
                int factorial = 1;
                int currentNumber = n1 % 10;
                n1 /= 10;


                for (int i = 1; i <= currentNumber; i++)
                {
                    factorial *= i;
                }
                sum += factorial;
            }


            return sum /= divider;

        }
    }
}