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

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    sort(calories.begin(), calories.end());
    reverse(calories.begin(), calories.end());
    // your code goes here
    long miles = 0;
    for(int i = 0; i < n; i++)
        miles = miles + calories[i]*pow(2, i);    
    cout << miles << endl;
    return 0;
}