from collections import Counter
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

ca = Counter(A)
cb = Counter(B)

ans = N * (ca[2] + cb[2]) - ca[2] * cb[2]
if ca[2]:
    cb[1] = 0
if cb[2]:
    ca[1] = 0

ans += max(ca[1], cb[1])
print(ans)