public class FactorialExample {

    public static void main (String[] argv)
    {
        System.out.println ( "3! = " + factorial(3) );
        System.out.println ( "5! = " + factorial(5) );
        System.out.println ( "5! x 3! = " + (factorial(3) * factorial(5)) );
    }
    
    static int factorial (int n)
    {
        if (n == 1) {
            return 1;
        }
        return ( n * factorial(n-1) );
    }

}