#include<bits/stdc++.h>
// #include<atcoder/all>

using namespace std;
// using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007

ll calc(ll k,ll l){
  ll res = 0;
  while(l--){
    res += k;
    k >>= 1;
  }
  return res;
}

int main(){
  
  ll d;
  cin >> d;
  ll res = 1ll*MOD*MOD;
  rep(i,70){
    ll l = 1,r = 1e18;
    while(r-l > 1){
      ll mid = (l+r)/2;
      if(calc(mid,i) <= d)l = mid;
      else r = mid;
    }
    if(calc(l,i) == d)res = min(res,l);
  }
  cout << res << "\n";
  

  return 0;
}