#include <bits/stdc++.h>
using namespace std;
#define repl(i, l, r) for (ll i = (l); i < (r); i++)
#define rep(i, n) repl(i, 0, n)
#define CST(x) cout << fixed << setprecision(x)
using ll = long long;
constexpr ll MOD = 1000000007;
constexpr int inf = 1e9 + 10;
constexpr ll INF = (ll)4e18 + 10;
constexpr int dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
constexpr int dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
template <typename T>
inline bool chmax(T &a, T b) {
    return ((a < b) ? (a = b, true) : (false));
}
template <typename T>
inline bool chmin(T &a, T b) {
    return ((a > b) ? (a = b, true) : (false));
}
int main() {
    cin.tie(0);
    cout.tie(0);
    ios::sync_with_stdio(false);

    ll n;
    cin >> n;
    vector<ll> vec;
    ll p = 1;
    while (n) {
        if (n % 2) vec.push_back(p);
        p *= 2, n /= 2;
    }
    ll x = 1LL << (ll)vec.size();
    x = (x + 1) / 2;
    ll ans = 0;
    rep(i, (ll)vec.size()) {
        if (x >> i & 1) ans += vec[i];
    }

    cout << ans << endl;

    return 0;
}