Factorial Numbers used C# program

Factorial Numbers

using System;

namespace factorial

{

    class Program

    {

        static void Main(string[] args)

        {

            int num;

            Console.WriteLine("Enter the value of Num=");

            num = Convert.ToInt32(Console.ReadLine());

            decimal f = factorial(num);

            Console.WriteLine(f);

            Console.ReadKey();

        }

        static decimal factorial(int n)

        {

            if (n == 0)

                return 1;

            else

                return n*factorial(n - 1);

        }

    }

}