#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];
    }
    
    sort(calories.begin(), calories.end());
    
    unsigned long long miles = 0;
    for(int i = calories.size() - 1; i >= 0; --i)
    {
        miles += calories[i] * pow(2, calories.size() - i - 1);
    }
    
    cout << miles;
    return 0;
}