#include <bits/stdc++.h>

using namespace std;

bool comp(int a, int b) {
    return a > b;
}

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(), comp);
    long long miles = 0;
    long long factor = 1;
    for (int i = 0; i < n; ++i) {
        miles += calories[i] * factor;
        factor *= 2;
    }
    cout << miles << endl;
    return 0;
}