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

int main(){
  long long n;
  cin >> n;
  long long a = 0;
  long long b = 0;
  while(n > 0){
    a += n;
    b = max(b, n * 2);
    n /= 2;
  }
  long long ans = b - a;

  cout << ans << endl;
}