import heapq
def cookies(k, A):
    operations = 0
    heapq.heapify(A) 

    while A[0] < k and len(A) > 1:
        heapq.heappush(A, heapq.heappop(A) + 2 * heapq.heappop(A))
        operations += 1

    return operations if A[0] >= k else -1