题解 | 称砝码

n = int(input())
weights = [int(i) for i in input().split()]
nums = [int(i) for i in input().split()]
set1 = set()
set1.add(0)
for i in range(n):
    for num in range(1,nums[i]+1):
        tempset = set()
        for j in set1:
            tempset.add(j+weights[i])
        set1 |= tempset
print(len(set1))