Factorial

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

namespace Factorial
{
    class Factorial
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());
            var factorial = number;

            for(int i = 1; i < number; i++)
            {
                factorial = factorial * ( number - i );
            }
            Console.WriteLine(factorial);

            /* Second solution */
            //var n = int.Parse(Console.ReadLine());
            //var factorial = 1;
            //do
            //{
            //    factorial = factorial * n;
            //    n--;
            //} while(n > 1);
            //Console.WriteLine(factorial);
        }
    }
}