n = int(input())
s = list(map(int, input().split()))
t = list(map(int, input().split()))
s2 = s.count(2)
t2 = t.count(2)
ans = n**2 - (n - s2) * (n - t2)
s1 = s.count(1)
t1 = t.count(1)
if s2:
    t1 = 0
if t2:
    s1 = 0
ans += max(s1, t1)
print(ans)