#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL_
void debug_out() {cerr << endl;}
template<typename Head,typename... Tail> void debug_out(Head H,Tail... T){cerr << ' ' << H; debug_out(T...);}
#define debug(...) cerr << 'L' << __LINE__ << " [" << #__VA_ARGS__ << "]:",debug_out(__VA_ARGS__)
#define dump(x) cerr << 'L' << __LINE__ << " " << #x << " = " << (x) << endl;
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
#define rep(i,n) for (int i = 0; i < (int)(n); i ++)
#define irep(i,n) for (int i = (int)(n) - 1;i >= 0;--i)
using ll = long long;
using PL = pair<ll,ll>;
using P = pair<int,int>;
constexpr int INF = 1000000000;
constexpr long long HINF = 100000'00000'00000'000;
constexpr long long MOD = 1000000007;// = 998244353;
constexpr double EPS = 1e-4;
constexpr double PI = 3.14159265358979;

template<typename T1,typename T2> ostream &operator<<(ostream &os,const pair<T1,T2> &p) {
    os << '(' << p.first << ',' << p.second << ')'; return os;
}
template<typename T> ostream &operator<<(ostream &os,const vector<T> &v) {
    os << '[';
    for (auto &e:v) {os << e << ',';}
    os << ']'; return os;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);

    ll D; cin >> D;
    auto ok = [&](ll x,int k) {
        ll ret = 0;
        rep(i,k) {
            ret += x;
            x /= 2;
        }
        return ret >= D;
    };
    ll ans = HINF;
    rep(k,70) {
        ll r = D + 10;
        ll l = 1;
        while (r - l > 1) {
            ll mid = (r + l)/2;
            if (ok(mid,k)) r = mid;
            else l = mid;
        }
        ans = min(ans,r);
    }
    cout << ans << '\n';
    return 0;
}