Boxes.java

public class Boxes {
    public static int minimalNumberOfBoxes(int products, int availableLargeBoxes, int availableSmallBoxes) {
        int smallBoxes = products % (availableLargeBoxes * 5);
        int bigBoxes = products - (smallBoxes * 5);
        
        if (((availableLargeBoxes * 5) + availableSmallBoxes) <  products) {
			return -1;
		}
        
    	return (bigBoxes + smallBoxes) * -1;
    }
    
    public static void main(String[] args) {
        System.out.println(minimalNumberOfBoxes(16, 2, 10));
    }
}