public class SapaanApp {
    public static void main(String[] args) {
        String nama = args.length > 0 ? args[0] : "Budi";
        int kuadrat = UtilMath.kuadrat(nama.length());

        System.out.println("Halo, " + nama + "!");
        System.out.println("Panjang nama dikuadratkan: " + kuadrat);
    }
}