n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
tina = 2 in a
tinb = 2 in b
if tina and tinb:
    print(n ** 2)
elif tina:
    print(a.count(2) * n + a.count(1))
elif tinb:
    print(b.count(2) * n + b.count(1))
else:
    print(max(a.count(1), b.count(1)))