#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    long long int miles = 0;
    int j = 0;
    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());
    
    for(int i = n-1; i >= 0; i--){
        miles += (pow(2,j)*calories[i]);
        j++;
    }
    // your code goes here
    cout << miles << endl;
    return 0;
}