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]) {
            let digit_sum: i32 = if d < 10 {
                d
            } else {
                d.to_string().chars().fold(0, |sum, i| sum + i.to_digit(10).unwrap() as i32)
            };
            if digit_sum == m as i32 {
                count += 1;
            }
        }
    }
    println!("{}", count);
}