#include <bits/stdc++.h>
using namespace std;
#include <math.h>
#include <iomanip>
#include <cstdint>
#include <string>
#include <sstream>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
#define rep(i,n) for (int i = 0; i < (n); ++i)
typedef long long ll;
using P = pair<int,int>;
const int INF=1001001001;
const int mod =1e9+7;
ll f(ll x,ll k){
  ll sum=0;
  while(k--){
    sum+=x;
    x/=2;
  }
  return sum;
}

int main() {
  ll d;cin>>d;
  ll ans=1e18+5;
  for(int k=0;k<=log2(d)+1;k++){
    ll l=0,r=d;
    while(r-l>1){
      ll mid=(l+r)/2;
      if(f(mid,k)>=d){r=mid;}
      else{l=mid;}
    }
    if(f(r,k)==d){chmin(ans,r);}
  }
  cout<<ans<<endl;
  return 0;
}