#include <bits/stdc++.h>
#include <iostream>
#include <algorithm>
#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];
    }
    
    long int miles = 0;
    sort(calories.begin(),calories.end());
    reverse(calories.begin(),calories.end());
    for(int i = 0; i < n; i++){
       miles = miles + pow(2,i)*calories[i];
    }
    // your code goes here
    cout<<miles;
    return 0;
}