Factorial division

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

namespace Factorial_division
{
    class Program
    {
        static void Main(string[] args)
        {
            int first = int.Parse(Console.ReadLine());
            int second = int.Parse(Console.ReadLine());

            FirstFactorial(first);
            SecondFactorial(second);

            Console.WriteLine($"{FinalResult(first, second):F2}");
        }
        static int FirstFactorial(int a)
        {
            int current = 1;
            int actual = 0;

            if (a >= 1)
            {
                for (int num = a; num >= 1; num--)
                {
                    actual = num;
                    current = actual * current;
                }
            }
            return current;
        }
        static int SecondFactorial(int b)
        {
            int digit = 1;
            int value = 0;

            if (b >= 1)
            {

                for (int num = b; num >= 1; num--)
                {
                    value = num;
                    digit = value * digit;
                }
            }
            return digit;
        }
        static double FinalResult(int a, int b)
        {
            double calculation = FirstFactorial(a) / SecondFactorial(b);
            return calculation;
        }

    }
}