use proconio::input;

fn main () {
    input! {
        n: u64,
    }
    let m = n & (n-1);
    if m == 0 {
        println!("{}", 0);
    }
    else {
        let mut m = n;
        let mut bits : u32 = 0;
        while m > 0 {
            if (m&1) == 1 { bits += 1; }
            m = m>>1;
        }
        println!("{}", 2_u64.pow(bits)-2);
    }
}