from heapq import heappush, heappop, heapify

def cookies(k, A):
    heapify(A)
    i = 0
    while A[0] < k and len(A) > 1:
        heappush(A, heappop(A) + (heappop(A) * 2))
        i += 1
    return i if A[0] >= k else -1