#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

void solve() {
    ll D;
    cin >> D;
    ll ans = LLONG_MAX;
    for (int i = 1; i < 64; ++i) {
        auto f = [&](ll x) {
            ll y = 0;
            rep(j, i) {
                y += x;
                x >>= 1;
            }
            return y;
        };
        ll ok = 0, ng = D + 1;
        while (ng - ok > 1) {
            ll x =(ok+ng)/2;
            (f(x) <= D ? ok : ng) = x;
        }
        ll y = f(ok);
        if (y == D)smin(ans, ok);
    }

    cout << ans << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(15);
    solve();
    return 0;
}