public static int cookies(int k, List<int> A)
    {
        int count = 0;
        var pqueue = new PriorityQueue<int,int>();
    
        foreach(int e in A)
            pqueue.Enqueue(e,e);   
        
        while(pqueue.Count>1) {
            int x = pqueue.Dequeue();
            if(x>=k) {
                return count;
            }
            else {
                
                int y = pqueue.Dequeue();
                int c = x + (2*y);
                pqueue.Enqueue(c,c);
                count++;
            }
        }
        
        if(pqueue.Peek()>=k)
            return count;
        else
            return -1;    
    }