N = int(input())
A = list(map(int, input().split()))
M = int(input())
B = list(map(int, input().split()))
B.sort(reverse=True)
score = [0]*(1<<N)

for S in range(1<<N):
    for i in range(N):
        if (S>>i)&1:
            score[S] += A[i]
            
dp = [[False]*(1<<N) for _ in range(M+1)]
dp[0][0] = True

for i in range(M):
    for S in range(1<<N):
        T = S
        
        while True:
            dp[i+1][S] |= dp[i][T] and B[i]>=score[S-T]
            T = (T-1)&S
            
            if T==S:
                break

    if dp[i+1][-1]:
        print(i+1)
        break
else:
    print(-1)