use std::io;

fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input)
        .expect("Read error");
    let n: u64 = input.trim().parse().unwrap();
    println!("{}", solve(n));
}

fn solve(n: u64) -> u64 {
    let mut acc: u64 = 0;
    let mut n2 = n;

    loop {
        if n2 == 0 { break; }

        acc += n2;
        n2 /= 2;
    }
    2*n - acc
}

#[test]
fn it_works() {
    assert_eq!(2, solve(12));
    assert_eq!(31, solve(123456789123456789));
}