#include <iostream>
#include <algorithm>
using namespace std;

int main() {
  long long N;
  cin >> N;

  long long normal = N;
  long long maxv = N;
  for (int i = 1; ; i++) {
    int cnt = 0;
    long long tmp = 0; 
    for (long long j = N; j > 0; j /= 2) {
      cnt++;
      if (cnt == i) {
        tmp += 2 * j;
        break;
      }
      tmp += j;
    }
    if (i > cnt) {
      normal = tmp;
      break;
    }
    maxv = max(maxv, tmp);
  }
  cout << maxv - normal << endl;
  return 0;
}