// this MUST be the first line
import javax.swing.JOptionPane;
public class factorial extends Object
{   
    public static void calculatefactorial () {
        String s = JOptionPane.showInputDialog("Enter in the number: ");    
        int enterednum = Integer.parseInt(s);
        int result = 1;
        for (int counter = 1; counter <= enterednum; counter++) {
            result = result * counter;            
        }
        JOptionPane.showMessageDialog(null, "" + result);
    }
}