class Factorial {

   public static void main (String[] args) {

      System.out.println ("5! = 1*2*3*4*5 = " + fact(5));
   }

   static int fact (int number) {

      int result;
      if (number == 1)
         return 1;
      else
         result = number * fact(number - 1);
      return result;
   }
}