int cookies(int k, vector<int> arr) {
    priority_queue<int, vector<int>, greater<int>> pq(arr.begin(), arr.end());
    int count = 0;

    while (pq.size() > 1 && pq.top() < k)
    {
        int first = pq.top();
        pq.pop();
        int second = pq.top();
        pq.pop();

        pq.push(first + 2 * second);
        count++;
    }
    return (pq.top() >= k) ? count : -1;   
}