public static int cookies(int k, List<Integer> A) {
    // Write your code here
        PriorityQueue<Integer> q = new PriorityQueue<>();
        
        for (int i : A) q.add(i);
        
        int operations = 0;
        
        while (q.peek() < k && q.size() >= 2){
            int smaller = q.remove();
            int small = q.remove();
            int mix = smaller + (small * 2);
            q.add(mix);
            operations++;
        }
        
        return (q.peek() >= k) ? operations : -1; 
    }