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

using namespace std;

bool maxVal(int i, int j){
    return i > j; 
}

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    
    sort(calories.begin(), calories.end(), maxVal);
    long int miles = 0;
    for(int i = 0; i < calories.size(); ++i){
        miles += calories[i] * pow(2, i);
    }
    
    cout << miles << endl;
    
    return 0;
}