use std::io::{self, Read};

#[derive(Debug)]
struct Input {
    n: usize,
}

fn next_token(cin_lock: &mut io::StdinLock) -> String {
    cin_lock
        .by_ref()
        .bytes()
        .map(|c| c.unwrap() as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect::<String>()
}

fn read_input(cin_lock: &mut io::StdinLock) -> Input {
    Input {
        n: next_token(cin_lock).parse().unwrap(),
    }
}

fn solve(input: &Input, _cin_lock: &mut io::StdinLock) {
    let mut counts = vec![None; input.n];
    counts[0] = Some(1);

    let mut positions = vec![1];
    while !positions.is_empty() {
        let p = positions.pop().unwrap();
        let next_count = counts[p - 1].unwrap() + 1;
        let bits = p.count_ones() as usize;

        let can_shorten = |c| match c {
            Some(n) => next_count < n,
            None => true,
        };

        if p + bits <= input.n {
            let next_p = p + bits;
            if can_shorten(counts[next_p - 1]) {
                counts[next_p - 1] = Some(next_count);
                positions.push(next_p);
            }
        }

        if p >= 1 + bits {
            let next_p = p - bits;
            if can_shorten(counts[next_p - 1]) {
                counts[next_p - 1] = Some(next_count);
                positions.push(next_p);
            }
        }
    }

    let answer = match counts[input.n - 1] {
        Some(a) => a as i32,
        None => -1,
    };
    println!("{}", answer);
}

fn main() {
    let cin = io::stdin();
    let mut cin_lock = cin.lock();

    let input = read_input(&mut cin_lock);
    solve(&input, &mut cin_lock);
}