using System;

public class Program

{

    public static void Main()

    {

        again:

        int n=0;

        int numero=0;

        int factorial=1;

        string valor="";

        Console.WriteLine("pasame el numero pa´ sacarle factorial");

        valor= Console.ReadLine();

        numero= Convert.ToInt32(valor);

        for (n=numero; n>= 1;n-))

            factorial *=n ;

        Console.WriteLine("el factorial de {0} es {1}", numero, factorial);

        goto again;

    }

}