from itertools import permutations

INF = 1 << 60
N = int(input())
A = list(map(int, input().split()))
M = int(input())
B = list(map(int, input().split()))


def put(xs) -> int:
    p = 0
    caps = [0] * N
    for x in xs:
        while p < N and caps[p]+x > B[p]:
            p += 1

        if p == N: return -1
        caps[p] += x

    return p+1


ans = INF
for ps in permutations(A):
    res = put(ps)
    if res == -1: continue
    ans = min(ans, res)

if ans == INF:
    print(-1)
else:
    print(ans)