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

int main ()
{
  int n;
  cin >> n;
  
  vector <long long> a;
  for (int i = 0; i < n; i++)
  {
    int num;
    cin >> num;
    a.push_back (num);
  }
  
  sort (a.begin(), a.end());
  reverse (a.begin(), a.end());
  
  long long ans = 0;
  
  for (int k = 0; k < n; k++)
    ans += (1LL << k) * a[k];
  
  cout << ans << '\n';
}