#include <bits/stdc++.h>
using namespace std;

using ll = long long;
int main(){
    ll n;
    while(cin >> n){
        ll ans = 0;
        ll cur = 0;
        while(n){
            ans = max(ans, cur + n*2);
            cur += n;
            n /= 2;
        }
        cout << ans-cur << endl;
    }
}