use std::cmp::*;
use std::collections::*;
use std::io::*;
use std::str::FromStr;
fn read<T: FromStr>() -> T {
    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 n:usize = read();
    let mut a = (0,0);
    let mut now = 1;
    while now <= n{
        now *= 2;
    }
    a = (now / 2,now);
    if a.0 < n{
        println!("{}",a.1 - n);
    }else if a.0 == n{
        println!("{}",0);
    }else{
        println!("{}",a.0 - n);
    }
}