use proconio::input;

fn main() {
    input! {
        d: usize,
    }

    let search_init_dist = |times: usize| {
        let calc_sum_dist = |init_dist: usize| (0..times).map(|i| init_dist >> i).sum::<usize>();

        let mut ok = d;
        let mut ng = 0_usize;

        while ok.abs_diff(ng) > 1 {
            let mid = (ok + ng) / 2;

            if calc_sum_dist(mid) >= d {
                ok = mid;
            } else {
                ng = mid;
            }
        }

        if calc_sum_dist(ok) == d {
            Some(ok)
        } else {
            None
        }
    };

    let ans = (1..=60).filter_map(search_init_dist).min().unwrap();
    println!("{}", ans);
}