#[allow(dead_code)]
#[allow(unused_imports)]
fn read<T: std::str::FromStr>() -> T {
    use std::io::*;
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}
fn main(){
    let t:String = read();
    let s:Vec<char> = t.chars().collect();
    if s[0] == '-' {
        println!("{}",0);
    }else{
        let mut ans = String::new();
        for i in 0..s.len() - 2 {
            ans.push(s[i]);
        }
        if s.len() < 2 {
            ans.push('0');
        }
        println!("{}",ans);
    }
}