fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn main() {
    let n:u32 = read();

    if n == 1 {
        println!("0");
        std::process::exit(0);
    }

    let mut cells = vec![];
    for i in 1..=n {
        cells.push(i.count_ones() as i32);
    }
    println!("{:?}", &cells);

    let max = cells.len() - 1;
    let mut idx = 0;
    let mut count = 0;
    loop {
        let speed: i32 = cells[idx];
        if speed + idx as i32 > max as i32 && idx as i32 - speed < 0 {
            println!("-1");
            std::process::exit(0);
        } else if speed + idx as i32 > max as i32 {
            idx -= speed as usize;
        } else {
            idx += speed as usize;
        }
        count += 1;
        if count > max {
            println!("-1");
            std::process::exit(0);
        }
        if idx == max {
            count += 1;
            break;
        }
    }

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