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 1..13 {
        let mut day = (0, i);
        for j in 0..i+1 {
            if (day.0 * 10 + day.1) <= month_day_max[i - 1] {
                if day.0 + day.1 == i {
                    counter += 1;
                }
            }

            if j == i { break; }

            day.0 += 1;
            day.1 -= 1;
        }
    }
    
    println!("{}", counter);
}