01. Guinea Pig

package examPrep;

import java.util.Scanner;

public class P01GuineaPig {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double foodQuantityKg = Double.parseDouble(scanner.nextLine());
        double hayQuantityKg = Double.parseDouble(scanner.nextLine());
        double coverQuantityKg = Double.parseDouble(scanner.nextLine());
        double guineaWeightKg = Double.parseDouble(scanner.nextLine());

        double foodQuantityGr = foodQuantityKg * 1000;
        double hayQuantityGr = hayQuantityKg * 1000;
        double coverQuantityGr = coverQuantityKg * 1000;
        double guineaWeightGr = guineaWeightKg * 1000;

        boolean isNotEnough = false;
        for (int day = 1; day <= 30; day++) {
            foodQuantityGr = foodQuantityGr - 300;
            if (day % 2 == 0) {
                double currentHay = foodQuantityGr * 0.05;
                hayQuantityGr = hayQuantityGr - currentHay;
            }

            if (day % 3 == 0) {
                double currentCover = guineaWeightGr / 3;
                coverQuantityGr = coverQuantityGr - currentCover;
            }

            if (foodQuantityGr <= 0 || hayQuantityGr <= 0 || coverQuantityGr <= 0) {
                isNotEnough = true;
                break;
            }
        }

        if (isNotEnough) {
            System.out.println("Merry must go to the pet store!");
        } else {
            System.out.printf("Everything is fine! Puppy is happy! Food: %.2f, Hay: %.2f, Cover: %.2f.",
                    foodQuantityGr / 1000, hayQuantityGr / 1000, coverQuantityGr / 1000);
        }
    }
}