kind = int(input())
weigth = list(map(int, input().split()))
quantity = list(map(int, input().split()))
w_q = []

for i in range(kind):
    for j in range(quantity[i]):
        w_q.append(weigth[i])

wq = {0, }
for m in w_q:
    for q in list(wq):
        wq.add(m+q)
print(len(wq))