fn main() {
    let month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    let mut cnt = 0;
    for (m, ds) in month.iter().enumerate() {
        let m = m as i32 + 1;
        for d in 1 .. *ds {
            let p = d / 10;
            let q = d - p * 10;
            if m == p + q { cnt += 1; }
        }
    }
    println!("{}", cnt);
}