//
// Created by yamunaku on 2020/11/13.
//

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

using namespace std;
//using namespace atcoder;

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repl(i, l, r) for(int i = (l); i < (r); i++)
#define per(i, n) for(int i = ((n)-1); i >= 0; i--)
#define perl(i, l, r) for(int i = ((r)-1); i >= (l); i--)
#define all(x) (x).begin(),(x).end()
#define MOD9 998244353
#define MOD1 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000
#define SP <<" "<<
#define CYES cout<<"Yes"<<endl
#define CNO cout<<"No"<<endl
#define CFS cin.tie(0);ios::sync_with_stdio(false)
#define CST(x) cout<<fixed<<setprecision(x)

using ll = long long;
using ld = long double;
using vi = vector<int>;
using mti = vector<vector<int>>;
using vl = vector<ll>;
using mtl = vector<vector<ll>>;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
template<typename T>
using heap = priority_queue<T, vector<T>, function<bool(const T, const T)>>;

int main(){
    //CFS;
    ll d;
    cin >> d;
    ll ans = LINF;
    rep(i,70){
        ll l = 1, r = LINF;
        while(r - l > 1){
            ll mid = (l+r)/2;
            ll k = mid;
            ll tmp = 0;
            rep(j, i+1){
                tmp += k;
                k/=2;
            }
            if(tmp <= d){
                l = mid;
            }else{
                r = mid;
            }
        }
        ll tmp = 0, k = l;
        rep(j, i+1){
            tmp += k;
            k/=2;
        }
        if(tmp == d){
            ans = min(ans, l);
        }
    }
    cout << ans << endl;
    return 0;
}