public class Fact2 
{
    public static void main (String[] args) 
    {
        System.out.println ("5! = 1*2*3*4*5 = " + fact(5));
    }

    static int fact (int number) 
    {
        if (number == 0)
            return 1;
        else
            return number * fact(number - 1);
   }
}