Guinea Pig

package Fundamentals.Exams;

import java.util.Scanner;

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


        double foodQuantity = Double.parseDouble(scanner.nextLine()) * 1000;
        double hayQuantity = Double.parseDouble(scanner.nextLine()) * 1000;
        double coverQuantity = Double.parseDouble(scanner.nextLine()) * 100;
        double guineaWeight = Double.parseDouble(scanner.nextLine()) * 100;

        int days = 1;

        while (days <= 30) {

            foodQuantity -= 300;
            if (days % 2 == 0) {
                hayQuantity -= foodQuantity * 0.05;
            }
            if (days % 3 == 0) {
                coverQuantity -= guineaWeight / 3;
            }
            days++;
        }

        foodQuantity /= 1000;
        hayQuantity /= 1000;
        coverQuantity /= 1000;
        boolean checker = foodQuantity >0 && hayQuantity > 0 && coverQuantity > 0;
        if (checker) {
            System.out.printf("Everything is fine! Puppy is happy! Food: %.2f, Hay: %.2f, Cover: %.2f.", foodQuantity, hayQuantity, coverQuantity);
        } else {
            System.out.println("Merry must go to the pet store!");
        }
    }
}