using System;

public class Program

{

    public static void Main()

    {

        int c, f=1, n ;

        //ciclo while de 1 - n

        Console.WriteLine("Ingrese el numero: ");

        n = int.Parse(Console.ReadLine());

        c=n;

        while(c >= 1)

        {

            f = f*c;

            c--;

        }

        Console.WriteLine("Factorial: "+f);

    }

}