#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

long get_miles(const vector<int> &v){
	long ans = 0;
	for(int i = 0; i < v.size(); i++){
		long pow_2 = pow(2, i);
		ans += (pow_2 * v[i]);
	}
	return ans;
}

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    
    sort(calories.begin(), calories.end(), greater<int>());

    cout << get_miles(calories) << endl;

    return 0;
}