#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    int *calories =  new int[n];

    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    // your code goes here

   std::sort(calories, calories+n, std::greater<int>());

   long miles =0;

   for(int i=0;i<n;i++)
   {
   		miles = miles + calories[i]*pow(2,i);
   }

   cout << miles;

    return 0;
}