use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    
    let n: usize = buf.trim().parse().unwrap();
    if n == 1 {
        println!("1");
        return
    }
    
    let mut positions: Vec<usize> = vec![1];
    let mut is_checked: Vec<bool> = vec![false; n+1];
    let mut layer: usize = 1;
    
    'outer: loop {
        layer += 1;
        
        let mut new_positions: Vec<usize> = vec![];
        for p in positions.iter() {
            let ones: usize = p.count_ones() as usize;
            let forward: usize = p + ones;
            let backward: usize = p.saturating_sub(ones);
            
            if forward == n || backward == n {
                println!("{}", layer);
                break 'outer;
            }
            
            if forward > 1 &&
               forward < n &&
               !is_checked[forward] {
                new_positions.push(forward);
                is_checked[forward] = true;
            }
            if backward > 1 &&
               backward < n &&
               !is_checked[backward] {
                new_positions.push(backward);
                is_checked[backward] = true;
            }
        }
        
        if new_positions.is_empty() {
            println!("-1");
            break 'outer;
        }
        
        positions = new_positions;
    }
}