#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];
    }
    // your code goes here
    
    sort(calories.begin(), calories.end(), greater<int>());
    
    unsigned long result = 0;
    
    for (int i = 0; i < n; i++) {
        result += (calories[i] * ((unsigned long)1 << i));
    }
    
    cout << result << endl;
    
    return 0;
}