#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  sort(a.begin(), a.end());
  int ans = 0;
  rep(i, 30) {
    int cnt = 1 << i;
    rep(_, cnt) {
      if (a.empty()) break;
      ans += a.back() * i;
      a.pop_back();
    }
  }
  cout << ans << endl;
  return 0;
}