from collections import Counter

N = int(input())
S = Counter(map(int, input().split()))
T = Counter(map(int, input().split()))

flag_vertical = 2 in S
flag_horizontal = 2 in T

if flag_vertical and flag_horizontal:
    ans = (S[2] + T[2]) * N - S[2] * T[2]
elif flag_vertical:
    ans = S[2] * N + S[1]
elif flag_horizontal:
    ans = T[2] * N + T[1]
else:
    ans = max(S[1], T[1])
print(ans)