题解 | #称砝码#

n = int(input())
m = list(map(int, input().strip().split(" ")))
x = list(map(int, input().strip().split(" ")))

s = set()
s.add(0)

for i in range(n):
    for num in s.copy():
        for j in range(x[i]):
            num += m[i]
            s.add(num)

print(len(s))