题解 | #称砝码#妙用集合的元素唯一性

def fama(n,weight,nums):
    res = set()
    res.add(0)
    for i in range(n):
        temp = list(res)
        for j in range(nums[i]+1):
            for x in temp:
                res.add(x+j*weight[i])
    return len(res)
            

n = int(input())
weight = list(map(int, input().split()))
nums = list(map(int, input().split()))

print(fama(n,weight,nums))