fn main() {
    let last_days = vec![31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    let mut count = 0;
    for m in 1..12 {
        for d in 1..=(last_days[m-1]) {
            if d / 10 + d % 10 == m as i32 {
                count += 1;
            }
        }
    }
    println!("{}", count);
}