#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;
template<class T> bool chmin(T& a,T b){if(a>b) {a = b; return true;} return false;}
template<class T> bool chmax(T& a,T b){if(a<b) {a = b; return true;} return false;}
#define rep(i,n) for(int i=0;i<(n);i++)
#define drep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(x) (x).begin(),(x).end()
#define debug(x)  cerr << #x << " = " << (x) << endl;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll D;
    cin >> D;
    ll inf = 1e18+10;
    ll ans = inf;
    auto calc = [&](int k){
        auto val = [&](ll x){
            ll sum = 0,now = x;
            rep(i,k){
                sum += now;
                now /= 2;
            }
            return sum;
        };
        ll l = 0,r = inf;
        while(l+1<r){
            ll m = (l+r)/2;
            (val(m)>=D? r:l) = m;
        }
        if(val(r)==D) chmin(ans,r);
    };
    rep(i,60) calc(i);
    cout << ans << "\n";
}