#include <bits/stdc++.h>
#include<algorithm>

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];
    }
    sort(calories.begin(),calories.end());
    long int miles=0;
    for(int i=n-1;i>=0;i--)
        {
        miles+=calories[i]*pow(2,n-i-1);
        
    }
    cout<<miles;
    // your code goes here
    return 0;
}