#include<bits/stdc++.h>
// #include<atcoder/all>
using namespace std;
// using namespace atcoder;
using lint = long long;
using graph = vector<vector<int>>;
#define endl '\n'
lint const mod = 1e9+7;
//long const mod = 998244353;


int main(){
    lint d;
    cin >> d;
    lint ans = d;
    for(int rep=1;rep<63;rep++){
        lint upper = d;
        lint lower = 1;
        while(upper > lower){
            lint mid = (upper + lower)/ 2;
            lint tmp = mid;
            lint kyori = mid;
            for(int i=0;i<rep;i++){
                tmp += (kyori/2);
                kyori/=2;
                if(kyori == 0)break;
            }
            if(tmp == d){
                ans = min(ans,mid);
                break;
            }
            if(tmp > d){
                upper = mid - 1;
            }else{
                lower = mid + 1;
            }
        }
    }
    cout << ans << endl;
}