#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.end());
    unsigned long int total = 0;
    for(int i = 0; i < n; i++) {
        total += calories[n-1-i]*pow(2,i);
    }
    cout << total << endl;
    return 0;
}