#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  ll N;
  cin >> N;
  vector<ll> meisei;
  ll sum = 0;
  while (N > 0) {
    meisei.push_back(sum + N * 2);
    sum += N;
    N /= 2;
  }
  sort(meisei.rbegin(), meisei.rend());
  cout << meisei[0] - sum << endl;
  return 0;
}