n = int(input())
s = list(map(int, input().split()))
t = list(map(int, input().split()))
ans = 0
cnt2_s = s.count(2)
cnt2_t = t.count(2)
ans += cnt2_s * n + cnt2_t * n - cnt2_s * cnt2_t
cnt1_s = 0 if cnt2_t else s.count(1)
cnt1_t = 0 if cnt2_s else t.count(1)
ans += max(cnt1_s, cnt1_t)
print(ans)