Easter Guests

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double guests = Double.parseDouble(scanner.nextLine()),
                budget = Double.parseDouble(scanner.nextLine());

        budget -= Math.ceil(guests / 3) * 4 + guests * 2 * 0.45;

        if (budget < 0) {
            System.out.printf("Lyubo doesn't have enough money.\nHe needs %.2f lv. more.", Math.abs(budget));
        } else {
            System.out.printf("Lyubo bought %d Easter bread and %d eggs.\nHe has %.2f lv. left.", (int) Math.ceil(guests / 3), (int) guests * 2, budget);
        }
    }
}

ИЛИ:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int guests = Integer.parseInt(scanner.nextLine()) * 2;
        double budget = Double.parseDouble(scanner.nextLine())
                - Math.ceil(1.0 * guests / 3) * 4 + guests * 0.45;

        if (budget < 0) {
            System.out.printf("Lyubo doesn't have enough money.\nHe needs %.2f lv. more.", Math.abs(budget));
        } else {
            System.out.printf("Lyubo bought %d Easter bread and %d eggs.\nHe has %.2f lv. left.", (int) Math.ceil(1.0 * guests / 3), guests, budget);
        }
    }
}