N = int(input())

S = list(map(int, input().split()))

T = list(map(int, input().split()))

s = S.count(2)
t = T.count(2)

ans = (s + t) * N - s * t

ans += max(sum([(i + t) % 2 if i != 2 else 0 for i in S]), sum([(i + s) % 2 if i != 2 else 0 for i in T]))

print(ans)