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

int main() {
  int N, ans = 0, i = 1;
  bool check = true;
  cin >> N;
  vector<int> A(N);
  for (int &a : A) cin >> a;
  sort(A.begin(), A.end());
  A.pop_back();

  while (check) {
    int j = 0;

    while (j < pow(2, i) && A.size()) {
      ans += A.at(A.size() - 1) * i;
      A.pop_back();
      j++;
    }

    if (A.size() == 0)
      check = false;
    i++;
  }

  cout << ans << endl;
}