use std::io;
use std::cmp;

fn main() {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();

    let mut n = s.trim().parse::<i64>().unwrap();
    let mut base = 0;
    let mut best = 0;

    while n > 0 {
        best = cmp::max(best, base + 2 * n);
        base += n;
        n /= 2;
    }

    println!("{}", best - base);
}