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

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  Int ans=n;
  Int sum=0;
  while(n){
    sum+=n;
    chmax(ans,sum+n);
    n/=2;
  }
  cout<<ans-sum<<endl;
  return 0;
}