#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());
    long walk=0;
    for(int i=n-1,j=0;i>=0;i--,j++){
        walk+=(pow(2,j)*calories[i]);
    }
    cout << walk;
    return 0;
}