题解 | #称砝码#

while True:
    try:
        n=int(input())
        mx=input().split(' ')
        xx=input().split(' ')
        li,li_ba=[0],[0]
        for m,x in zip(mx,xx):
            for i in range(1,int(x)+1):
                for j in li:
                    li_ba.append(j+int(m)*i)
            li=list(set(li_ba))
            li_ba=list(set(li_ba))
        print(len(li))
    except:
        break