N = int(input())
S = list(map(int,input().split()))
T = list(map(int,input().split()))
ans_s = 0
ans_t = 0
for i in S:
    if i == 1:
        ans_s+=1
    elif i == 2:
        ans_s += N
for j in T:
    if j == 1:
        ans_t+=1
    elif j == 2:
        ans_t += N
x = S.count(2)
y = T.count(2)
ans_max =0
if x == 0 or y == 0:
    ans_max = 0
else:
    ans_max = max(x,y)*N+(N-max(x,y))*min(x,y)
print(max(ans_s,ans_t,ans_max))