#include<iostream>
#include<algorithm>
#include<boost/multiprecision/cpp_int.hpp>
using namespace std;
namespace mp = boost::multiprecision;
main(){
 mp::cpp_int x;
 cin >> x;
 mp::cpp_int ans = 0, t = 0;
 while (x){
     t += x;
      if(ans < t + x) {
          ans = t + x;
      }
      x /= 2;
 }
  if(ans <t) {ans = t;}
  cout<<ans<<endl;
}