#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n;
    cin>>n;
    long int miles = 0;
    vector<int> calories(n);
    for(int i=0;i<n;i++){
        cin>>calories[i];
    }
    sort(calories.begin(),calories.end());
    reverse(calories.begin(), calories.end());
    for(int i=0;i<n;i++){
        miles += pow(2,i)*calories[i];
    }
    cout<<miles;
    return 0;
}