fn main() {
    let max_day = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

    let mut count = 0;
    for n in 1..=12 {
        for d in 1..=max_day[n - 1] {
            let day_split_1 =  d / 10;
            let day_split_2 = d % 10;
            if n == (day_split_1 + day_split_2) {
                count += 1;
            }
        }
    }
    println!("{}", count);
}