n = int(input())
C = list(map(int, input().split()))
R = list(map(int, input().split()))

if 2 in C and 2 in R:
    c, r = 0, 0
    for i in range(n):
        if C[i] == 2:
            c += 1
        if R[i] == 2:
            r += 1
    print((c + r) * n - c * r)
elif 2 in C:
    ans = 0
    for i in range(n):
        if C[i] == 1:
            ans += 1
        elif C[i] == 2:
            ans += n
    print(ans)
elif 2 in R:
    ans = 0
    for i in range(n):
        if R[i] == 1:
            ans += 1
        elif R[i] == 2:
            ans += n
    print(ans)
else:
    c, r = 0, 0
    for i in range(n):
        if C[i] == 1:
            c += 1
        if R[i] == 1:
            r += 1
    print(max(c, r))