fn dist(first: usize, times: usize) -> usize  {
    let mut ret = first;
    let mut base = first/2;
    for _ in 0..times {
        ret += base;
        base /= 2;
    }
    ret
}

fn main() {
    let mut d = String::new();
    std::io::stdin().read_line(&mut d).ok();
    let d: usize = d.trim().parse().unwrap();

    let mut result = d;
    for times in 1..32 {
        let mut lower = 1usize;
        let mut upper = d;
        while upper > lower {
            let middle = (upper + lower) / 2;
            if dist(middle, times) < d {
                lower = middle+1;
            } else {
                upper = middle;
            }
        }
        if dist(upper, times) == d {
            result = result.min(upper);
        }
    }
    println!("{}", result);
}