题解 | #称砝码#

typenum = int(input().strip())
wights,nums = [],[]
re = {0}
wights = list(map(int,input().strip().split(" ")))
nums = list(map(int,input().strip().split(" ")))
for i in range(len(wights)):
    for j in range(1,nums[i]+1):
        if re:
            tamp = []
            for k in re:
                tamp.append(wights[i]+k)
            for k1 in tamp:
                re.add(k1)
        else:
            re.add(wights[i])
print(len(re))