#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> c(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> c[calories_i];
    }
    auto v = c;
    long rez=0;
    for(int i = 0; i < n; i++)
        {
        auto p = max_element(v.begin(),v.end());
        rez+= *p*pow(2,i);
        v.erase(p);
    }
    cout << rez;
    // your code goes here
    return 0;
}