import sys,itertools
input=lambda:sys.stdin.readline().rstrip()
N=int(input())
A=list(map(int,input().split()))
M=int(input())
B=sorted(list(map(int,input().split())))[::-1]
A=itertools.permutations(A)
ans=-1
for i in A:
	temp=[0 for i in range(M)]
	for j in i:
		for k in range(M):
			if temp[k]+j<=B[k]:
				temp[k]+=j
				break
		else:
			break
	else:
		ans=max(ans,M-temp.count(0))
print(ans)