题解 | #称砝码#

n = int(input())
m, x = [0]*n, [0]*n
# # 防止后续去重算出总重量
# m_max = 0


m = list(map(int, input().split()))
x = list(map(int, input().split()))
# for i in range(n):
#     m_max += m[i]*x[i]


ct = 0

# 标志0-max 是否有取值
# m_flag = [0 for i in range(0, m_max+1)]
# m_flag[0] = 1
sum_m ={0,}
for i in range(n):
        # 已有质量加上新的质量 ,从后向前遍历
            for mm in list(sum_m):
                for j in range(1, x[i]+1):
                    sum_m.add(mm+m[i]*j)

                




ct = len(sum_m)

print(ct)