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

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr); cout.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

int main() {
    int n; cin >> n;
    auto a = vec<int>(uns, n);
    for (auto &e : a) cin >> e;
    sort(rbegin(a), rend(a));

    int ans = 0;

    int count = 0, limit = 1, enter = 0;
    for (auto e : a) {
        ans += count * e;
        ++enter;

        if (limit <= enter) {
            enter = 0;
            limit *= 2;
            ++count;
        }
    }

    cout << ans << endl;
}