public static int cookies(int k, List<int> A)
    {
        
        if (A.Count < 1) 
            return -1;
            
        int count = 0;
        PriorityQueue<int, int> q = new PriorityQueue<int, int>();
        
        for(int i =0; i < A.Count; i++)
        {
            q.Enqueue(A[i], A[i]);
        }
        
        while(q.Count > 1 && q.Peek() < k)
        {
            int min = q.Peek();
            int val = q.Dequeue()  + 2 * q.Dequeue() ;
            if (val < min) 
              return -1;
            count++;
            q.Enqueue(val,val);
            
        }
        
        if (q.Peek() >= k) 
            return count;
        else 
            return -1;
        

    }