fn calc(start: usize, times: usize) -> usize {
    let mut ret = 0usize;
    let mut base = start;
    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 i in 1..=60 {
        let mut lower = 1usize;
        let mut upper = d;
        while upper > lower {
            let middle = (upper + lower) / 2;
            let summary = calc(middle, i);
            if summary < d {
                lower = middle + 1;
            } else {
                upper = middle;
            }
        }
        if calc(upper, i) == d {
            result = result.min(upper);
        }
    }
    println!("{}", result);
}