#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];
    }
    
    std::sort(calories.begin(), calories.end());
    
    long result = 0;
    long mult = 1;
    for(int i = 0; i<calories.size(); i++){
        result += calories[calories.size()-1-i]*mult;
        mult *= 2;
    }
    std::cout<<result;
    return 0;
}