use std::io::{stdin, Read, StdinLock};
use std::str::FromStr;

struct Input {
    n: usize,
}

fn read_input(cin_lock: &mut StdinLock) -> Input {
    let n = next_token(cin_lock);
    Input { n }
}

fn f(n: u32, stack: i32, mut check_points: Vec<i32>) -> Vec<i32> {
    println!("{:?}", check_points);

    if check_points.len() <= n as usize {
        return check_points;
    }

    if check_points[n as usize] >= 0 {
        return check_points;
    }

    check_points[n as usize] = stack;
    let check_points = f(n + n.count_ones(), stack + 1, check_points);
    let check_points = f(n - n.count_ones(), stack + 1, check_points);
    return check_points;
}

fn solve(input: Input) -> i32 {
    let check_points = vec![-1; input.n + 1];

    return f(1, 1, check_points)[input.n];
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_solve() {
        assert_eq!(solve(Input { n: 1 }), 1);
        assert_eq!(solve(Input { n: 2 }), 2);
        assert_eq!(solve(Input { n: 3 }), 3);
        assert_eq!(solve(Input { n: 4 }), -1);
        assert_eq!(solve(Input { n: 5 }), 4);
        assert_eq!(solve(Input { n: 11 }), 9);
        assert_eq!(solve(Input { n: 300 }), 9);
    }
}

fn next_token<T: FromStr>(cin_lock: &mut StdinLock) -> T {
    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>()
        .parse::<T>()
        .ok()
        .unwrap()
}

fn main() {
    let cin = stdin();
    let mut cin_lock = cin.lock();
    let input = read_input(&mut cin_lock);

    println!("{}", solve(input));
}