fn main() {
    print_number(2 * 5 + 1);
    print_number(2 * (5 + 1));
    print_number(1 + 2 * 5 + 1);
    print_number((1 + 2) * 5 + 1);
    print_number(1 + 2 * (5 + 1));
    print_number((1 + 2) * (5 + 1));
}