use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn cast<T: FromStr>(s: &str) -> T {
    s.parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(cast::<T>).collect()
}

fn main() {
    let days: [u64; 13] = [0, 31, 28, 31, 30, 31, 30,
                              31, 31, 30, 31, 30, 31];

    let mut ans: u64 = 0;
    for m in 1..13 {
        for d in 1..days[m]+1 {
            if d / 10 + d % 10 == m as u64 {ans += 1};
        }
    }

    println!("{}", ans);
}