#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

ll dist(ll x, int k) {
    ll ret = 0;
    for (int i = 0; i < k; i++) {
        ret += x;
        x /= 2;
    }
    return ret;
}

int main() {
    ll D;
    cin >> D;
    ll best = D;
    for (int i = 1; i <= 64; i++) {
        ll l = 0;
        ll r = D;
        while (r - l > 1) {
            ll m = l + (r - l) / 2;
            if (dist(m, i) >= D) {
                r = m;
            } else {
                l = m;
            }
        }
        if (dist(r, i) == D) {
            chmin(best, r);
        }
    }
    cout << best << "\n";
    return 0;
}