fn read_line() -> String {
    let mut line = String::new();
    std::io::stdin().read_line(&mut line).unwrap();
    line
}

fn read_items<T>() -> Vec<T>
where
    T: std::str::FromStr,
    <T as std::str::FromStr>::Err: std::fmt::Debug,
{
    return read_line()
        .trim()
        .split(" ")
        .filter(|&s| s.len() > 0)
        .map(|s| s.parse::<T>().unwrap())
        .collect();
}
fn main() {
    let n = read_items::<usize>()[0];

    let mut ans = 1;
    while ans * 2 <= n {
        ans *= 2;
    }

    println!("{}", ans);
}