#include <bits/stdc++.h>
#include <algorithm>
#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];
    }
    // your code goes here
    sort(calories.begin(), calories.end());
    reverse(calories.begin(), calories.end());
    long int ans=0;
    for(int calories_i = 0; calories_i < n; calories_i++){
       ans += calories[calories_i]*pow(2,calories_i);
    }
    cout <<ans;
    
    return 0;
}