#include <bits/stdc++.h>

using namespace std;

bool asc (int i,int j) { return (i>j); }

int main(){
    int n;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    // your code goes here
    sort (calories.begin(), calories.end(),asc);
    long long result = 0;
    for(int i=0;i<n;i++) {
        result += calories[i]*pow(2,i);
    }
    cout << result << endl;
    return 0;
}