fn main() {
    let mut ns = String::new();
    std::io::stdin().read_line(&mut ns).unwrap();
    let ns = ns.trim();

    if ns.get(0..1).unwrap() == "-" || ns.len() <= 2 {
        println!("0");
    } else {
        println!("{}", ns.get(0..(ns.len() - 2)).unwrap());
    }
}