#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    long long r;
    cin >> n;
    vector<int> calories(n);
    for (auto &i: calories) cin >> i;
    sort(calories.rbegin(), calories.rend());
    r = 0;
    for (int i = 0; i < n; i++) {
        r += calories[i] * pow(2,i);        
    }
    cout << r;
    return 0;
}