BigInteger/Factorial

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

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

            BigInteger result = 1;


            for (int i = 1; i <= n; i++)
            {
                result *= i;
            }

            Console.WriteLine(result);
        }
    }
}