include

using namespace std; int main(){ long int n; cin >> n; long long int p = 0; int arr[n]; for(int i = 0; i < n; i++){ cin >> arr[i]; }

// Sort in descending order
sort(arr, arr + n, greater<int>());

for(int i = 0; i < n; i++){
    p += pow(2, i) * arr[i];
}

cout << p;

return 0;

}