private static int getFine(int day, int month, int year, int dueDay, int dueMonth, int dueYear) {
    int returned = year * 10000 + month * 100 + day;
    int due = dueYear * 10000 + dueMonth * 100 + dueDay;
    if (returned <= due) {
        return 0;
    } else if (year == dueYear && month == dueMonth) {
        return 15 * (day - dueDay);
    } else if (year == dueYear) {
        return 500 * (month - dueMonth);
    } else {
        return 10000;
    }
}

private static int funFee(int d, int m, int y, int dd, int dm, int dy) {
    return (y * 10000 + m * 100 + d) <= (dy * 10000 + dm * 100 + dd)
            ? 0
            : y == dy && m == dm
                ? 15 * (d - dd)
                : y == dy
                    ? 500 * (m - dm)
                    : 10000;
}