#include <bits/stdc++.h>

using namespace std;

bool comp(int x, int y){
    return x > y;
}
    
int main(){
    int n;
    cin >> n;
    vector<int> calories;
    for(int calories_i = 0; calories_i < n; calories_i++){
       int temp;
        cin >> temp;
        calories.push_back(temp);
    }
    
    sort(calories.begin(), calories.end(), comp);
    
    unsigned long long miles = 0;
    int count = 0;
    
    for(vector<int>::iterator it = calories.begin(); it != calories.end(); ++it){
        miles += (*it)*(pow(2, count));
        //cout << * it << " " << count << endl;
        count++;
    }
    
    cout << miles;
    return 0;
}