fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: u64 = n.trim().parse().unwrap();

    let k = n - 1;
    let answer = 2 * u64::BITS - (2 * k.leading_zeros() + k.count_ones());

    println!("{answer}");
}