#include <bits/stdc++.h>

using namespace std;

int main(){
    int n, i;
    long long int sum = 0;
    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.rbegin(), calories.rend());
    for(i=0; i<n; i++)
    {
        sum+= (calories[i]*(pow(2, i)));
    }
    cout<<sum<<endl;
    return 0;
}