#include <bits/stdc++.h>
#include <cmath>

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];
    }
    std::sort(calories.begin(), calories.end(), std::greater<int>());
    long sum = 0;
    int cup = 0;
    for(auto elem : calories){
        sum += (elem*pow(2,cup));
        cup++;
    }
    cout << sum;
    return 0;
}