"""

論理積が0が抜けてる
→1つ以上0

論理和0→全部0
論理和1→1つ1
論理積1→全部1

全0を含んでいる場合、
全1を含んでいる場合

"""

N = int(input())

S = list(map(int,input().split()))
T = list(map(int,input().split()))

a = [[None] * N for i in range(N)]

if 0 in S and 2 in S:
    ans = 0
    for i in S:
        if i == 1:
            ans += 1
        elif i == 2:
            ans += N
    print (ans)

elif 0 in T and 2 in T:
    ans = 0
    for i in T:
        if i == 1:
            ans += 1
        elif i == 2:
            ans += N
    print (ans)

elif 0 in S or 0 in T:

    tx = 0
    ty = 0
    for i in S:
        if i == 1:
            tx += 1
    for i in T:
        if i == 1:
            ty += 1

    print (max(tx,ty))

elif 2 in S and 2 in T:

    tx = 0
    ty = 0
    for i in S:
        if i == 2:
            tx += 1
    for i in T:
        if i == 2:
            ty += 1

    print (tx * N + ty * N - tx * ty)

elif 2 in S:
    ans = 0
    for i in S:
        if i == 1:
            ans += 1
        else:
            ans += N
    print (ans)

elif 2 in T:
    ans = 0
    for i in T:
        if i == 1:
            ans += 1
        else:
            ans += N
    print (ans)



else:
    print (N)