n = int(input())
A = list(map(int,input().split()))
m = int(input())
B = sorted(list(map(int,input().split())),reverse=True)

dp = [0]*(1<<n)
dp[0] = 1
for i,b in enumerate(B,1):
    for bit in range(1<<n)[::-1]:
        if dp[bit] == 0:
            continue
        
        for mask in range(1<<n):
            if bit & mask:
                continue
            count = 0
            for j in range(n):
                if mask >> j & 1:
                    count += A[j]
            if count <= b:
                dp[bit^mask] = 1
    if dp[-1]:
        print(i)
        exit()
print(-1)