#include <bits/stdc++.h>
#include<algorithm>
#include<cmath>
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];
    }
    int64_t miles=0;
    sort(calories.rbegin(),calories.rend());
    for(int i=0;i<n;i++)
        {
        miles+=calories[i]*pow(2,i);
    }
    cout<<miles;
    return 0;
}