FactorialDivision

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

namespace FactorialDivision
{
    class Program
    {
        static void Main()
        {
            double firstNumber = double.Parse(Console.ReadLine());
            double secondNumber = double.Parse(Console.ReadLine());

            double result = CalculateFirstNumberFactorial(firstNumber) / CalculateSecondNumberFactorial(secondNumber);
            Console.WriteLine($"{result:f2}");
        }
        public static double CalculateFirstNumberFactorial(double firstNumber)
        {
            double factorial = 1;

            for (double i = firstNumber; i >= 1; i--)
            {
                factorial *= i;
            }
            if(firstNumber == 0)
            {
                factorial = 1;
            }
            return factorial;
        }
        public static double CalculateSecondNumberFactorial(double secondNumber)
        {
            double factorial = 1;

            for (double j   = secondNumber; j >= 1; j--)
            {
                factorial *= j;
            }

            if(secondNumber == 0)
            {
                factorial = 1;
            }

            return factorial;
        }
    }
}