use std::io::{stdout, BufReader, BufWriter, Read, Write};

#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = Read::bytes(BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}
#[allow(unused_macros)]
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};
    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
    ($next:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}
#[allow(unused_macros)]
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };
    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };
    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };
    ($next:expr, bytes) => {
        read_value!($next, String).into_bytes()
    };
    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };
    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

fn main() {
    let out = stdout();
    let mut writer = BufWriter::new(out.lock());
    solve(&mut writer);
    writer.flush().unwrap();
}

fn solve<W: Write>(mut writer: W) {
    #[allow(unused_macros)]
    macro_rules! print {
        ($fmt:expr) => {
            write!(writer, $fmt).unwrap()
        };
        ($fmt:expr, $($arg:tt)*) => {
            write!(writer, $fmt, $($arg)*).unwrap()
        };
    }
    #[allow(unused_macros)]
    macro_rules! println {
        ($fmt:expr) => {
            writeln!(writer, $fmt).unwrap()
        };
        ($fmt:expr, $($arg:tt)*) => {
            writeln!(writer, $fmt, $($arg)*).unwrap()
        };
    }

    // Main Code
    input! {
        d: usize
    }
    let mut vec = Vec::new();
    for num in 1..=64 {
        let mut l = d / 2;
        let mut r = d + 1;
        while r - l > 1 {
            let mid = (l + r) / 2;
            if dist(mid, num) <= d {
                l = mid;
            } else {
                r = mid;
            }
        }
        if dist(l, num) == d {
            vec.push(l);
        }
    }
    println!("{}", vec.iter().min().unwrap());
}

fn dist(x: usize, num: usize) -> usize {
    let mut sum = 0;
    let mut y = x;
    for _ in 0..num {
        sum += y;
        y /= 2;
    }
    sum
}