#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 long result = 0;
    long long mult = 1;
    for (auto it = calories.rbegin(); it != calories.rend(); ++it)
    {
        result += (*it)*mult;
        mult <<= 1;
    }
    std::cout << result << std::endl;
    // your code goes here
    return 0;
}