fn main() {
    let day = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31].to_vec();
    let mut ans = 0;
    for i in 1..13 {
        for j in 1..day[i] + 1 {
            if i == j % 10 + j / 10 {
                ans += 1;
            }
        }
    }
    println!("{}", ans);
}