#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <stack>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;

int main(){
  ios::sync_with_stdio(false);
  ll N;
  cin >> N;
  ll ret1 = 0, ret2 = 0;
  ll a = N, b = 0;
  while(a>0){
    ret1 += a;
    ret2 = max(ret2, b + a*2);
    b += a;
    a /= 2;
  }
  cout << ret2 - ret1 << endl;
  
  return 0;
}