На задача 2 Wedding Party https://softuni.bg/downloads/svn/programming-basics/2018-09/Exam/2.%20Wedding%20Party.pdf, как да направя така, че ако бюджета не е достатъчен да ми даде грешка. Ето моя код до сега

package EXAM;

import java.util.Scanner;

public class WeddingParty {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        double guests = Double.parseDouble(scanner.nextLine());
        double budget = Double.parseDouble(scanner.nextLine());

        double remainingMoney = Math.abs(20 * guests - budget);
        double fireWorksPrice = 0.4 * remainingMoney;
        double donationMoney = remainingMoney - fireWorksPrice;

        System.out.printf("Yes! %.0f lv are for fireworks and %.0f lv are for donation", fireWorksPrice, donationMoney);




    }
}