fn main() {
    let mut buf = String::new();
    let mut input = {
        use std::io::Read;
        std::io::stdin().read_to_string(&mut buf).unwrap();
        buf.split_whitespace()
    };

    let s: String = input.next().unwrap().parse().unwrap();

    let score = s.chars().fold(0, |acc, c| match c {
        '0' => acc + 10,
        _ => acc + String::from(c).parse::<usize>().unwrap(),
    });

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