n = int(input())
s = list(map(int,input().split()))
t = list(map(int,input().split()))
ans = 0
if 2 in s:
    a = s.count(2)
    ans += a*n
    if 2 in t:
        b = t.count(2)
        ans += b*(n-a)
    else:
        b = s.count(1)
        ans += b
else:
    a = s.count(1)
    if 2 in t:
        b = t.count(2)
        ans += b*n+t.count(1)
    else:
        b = t.count(1)
        ans += max(a,b)
print(ans)