#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];
    }
    
    std::sort(calories.begin(), calories.end());
    long miles = 0;
    long pw = 1;
    for (int i=n-1; i>=0; --i) {
        miles += calories[i] * pw;
        pw = pw  << 1;
    }
    cout << miles << endl;
    
    // your code goes here
    return 0;
}