N = int(input())
S = list(map(int, input().split()))
T = list(map(int, input().split()))
s2 = S.count(2)
t2 = T.count(2)
cnt = 0
if not s2:
    cnt = max(cnt, T.count(1))
if not t2:
    cnt = max(cnt, S.count(1))
print((s2 + t2) * N - s2 * t2 + cnt)