from collections import *
N=int(input())
S=list(map(int, input().split()))
T=list(map(int, input().split()))
CS=Counter(S)
CT=Counter(T)
if CS[2]>0:
    CT[1]=0
if CT[2]>0:
    CS[1]=0

res=0
res+=N**2-(N-CS[2])*(N-CT[2])
res+=max(CS[1],CT[1])
print(res)