using System;

public class Program

{

    public static void Main()

    {

        int lnValor;

        long lnFactorial;

        Console.WriteLine("\t\t\t Factorial\n");

        Console.Write("Factorial de:  ");

        lnValor = Convert.ToInt16(Console.ReadLine());

        lnFactorial = 1;

        for(int lnI = 1; lnI <= lnValor; lnI++)

        {

            lnFactorial = lnFactorial * lnI;

        }

        Console.WriteLine("{0}! = {1}", lnValor, lnFactorial);

 } 

}