public static void main(String[] args) {
        Map<Integer, Integer> balls = new TreeMap<>((o1, o2) -> {
            if (o1 % 2 == 1) {
                return 1;
            }
            if (o1 % 2 != 1) {
                return -1;
            }
            return 0;
        });
        for (int i = 0; i < 20; i++) {
            balls.put(i + 1, (int) (20 + Math.random() * 40));
        }
        System.out.println(balls.toString());

    }