fn getline() -> String {
    let mut s = String::new();

    std::io::stdin().read_line(&mut s).ok();

    s.trim().to_string()
}

fn main() {
    let s = getline();
    let sum: u32 = s.split(' ')
        .fold(0, |acc, s| {
            acc + s.parse().unwrap_or(0)
        });

    println!("{}", 55 - sum);
}