#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];
    }
    // your code goes here
    sort(calories.begin(), calories.begin() + n);
    long int total = 0;
    for(int i = n-1; i >= 0; i--)
    {
       //cout << total << " : " << calories[i] << " : " <<pow(2,(n-1 - i));
       total += calories[i]*pow(2,(n-1 - i));
    }
    cout << total;
    return 0;
}