public class Fact1
{
    public static void main (String[] args) 
    {
        System.out.println ("5! = 1*2*3*4*5 = " + fact(5));
    }

    public static int fact (int number) 
    {
        int result = 1;
        for (int i = 1; i<=number; i++)
            result = result * i;
        return result;
   }
}