using System;
public class Program
{
public static void Main()
start:
Console.WriteLine("Introduce a number: ");
int n1 = Convert.ToInt32(Console.ReadLine());
int factorial = 1;
Console.Write("{0}! = ", n1);
for (int i = 1; i <= n1; i++)
factorial *= i;
Console.Write("{0} ", i);
if (i<n1)
Console.Write("x");
}
Console.Write("= {0} ", factorial);