N = int(input())
Ss = list(map(int, input().split()))
Ts = list(map(int, input().split()))

if 2 in Ss and 2 in Ts:
    s = Ss.count(2)
    t = Ts.count(2)
    print(s * N + t * N - s * t)
elif 2 in Ss and 2 not in Ts:
    s = Ss.count(2)
    print(s * N + Ss.count(1))
elif 2 in Ss and 2 not in Ts:
    Ss, Ts = Ts, Ss
    s = Ss.count(2)
    print(s * N + Ss.count(1))
else:
    print(max(Ss.count(1), Ts.count(1)))