use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let s = itr.next().unwrap();
    let t: Vec<char> = s.chars().collect();
    if t[0] == '-' {
        println!("0");
    } else {
        let n = s.len();
        if n > 2 {
            println!("{}", &s[..n - 2]);
        } else {
            println!("0");
        }
    }
}