#include <bits/stdc++.h>
#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];
    }
    
    std::sort(calories.rbegin(), calories.rend());
    
    int i;
    long int miles = 0;
    
    for(i = 0;i < n;i++)
    {
        miles = miles + (calories[i] * pow(2, i));
    }
    
    cout<<miles<<endl;
    // your code goes here
    return 0;
}