fn main() {
    let month_day_max = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    let mut counter = 0;
    
    for i in 0..12 {
        for j in 1..(month_day_max[i] + 1) {
            if (j / 10) + (j % 10) == (i + 1) {
                counter += 1;
            }
        }
    }
    println!("{}", counter);
}