private int getPriority(int number) {
        if (number >= 0 && number <= 5) {
            return 1;
        }

        if (number >= 6 && number <= 9) {
            return 2;
        }

        if (number >= 10 && number <= 12) {
            return 3;
        }

        if (number >= 13 && number <= 14) {
            return 4;
        }

        if (number == 15) {
            return 5;
        }

        return 1;
    }