#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
// #include <atcoder/all>

using boost::multiprecision::cpp_int;
using namespace std;
// using namespace atcoder;

#if __has_include("print.hpp")
  #include "print.hpp"
#endif

#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define per(i, n) for(ll i = n; i >= (ll)(0); i--)
#define ALL(x) (x).begin(), (x).end()
#define RALL(x) (x).rbegin(), (x).rend()
#define MOD 1000000007

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; }

typedef long long ll;
typedef pair<ll, ll> p;


int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll d;
  cin >> d;
  // cout << d/2 << endl;
  // cout << d/2-1e6 << endl;
  for (ll i = d/2-1e6; i <= d/2+1e6; i++) {
    if(i <= 0) continue;
    ll x = i;
    ll count = 0;
    while(1){
      count += x;
      x /= 2;
      if(count == d){
        cout << i << endl;
        exit(0);
      }
      if(x == 0) break;
    }
    if(i > d) break;
  }

}