#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;

typedef long long ll;

int main() {
    int N, S, T;
    vector<int> s(3, 0), t(3, 0);
    cin >> N;
    rep(i, N) {
        cin >> S;
        s[S]++;
    }
    rep(i, N) {
        cin >> T;
        t[T]++;
    }
    if (s[0] > 0) {
        if (t[0] > 0) {
            cout << max(s[1], t[1]) << "\n";
        } else {
            cout << s[2] * N + s[1] << "\n";
        }
    } else {
        if (t[0] > 0) {
            cout << t[2] * N + t[1] << "\n";
        } else {
            cout << (s[1] + s[2]) * (t[1] + t[2]) - s[1] * t[1] << "\n";
        }
    }
}