#include <bits/stdc++.h>
using namespace std;
/* typedef */
typedef long long ll;
typedef pair<int, int> pii;
/* constant */
const int INF = 1 << 30;
const ll LINF = 1LL << 61;
const int NIL = -1;
const int MAX = 10000;
const int mod = 1000000007;
const double pi = 3.141592653589;
/* global variables */
/* function */
/* main */
int main(){
    int n;
    cin >> n;
    vector<int> s(n), t(n);
    for (int i = 0; i < n; i++) cin >> s[i];
    for (int i = 0; i < n; i++) cin >> t[i];

    int s1 = 0, s2 = 0;
    int t1 = 0, t2 = 0;
    for (int i = 0; i < n; i++) {
        if (s[i] == 1) s1++;
        else if (s[i] == 2) s2++;
        if (t[i] == 1) t1++;
        else if (t[i] == 2) t2++;
    }

    int ans = 0;
    if (s2 > 0 && t2 > 0) ans = (s2 + t2) * n - s2 * t2;
    else if (s2 == 0 && t2 == 0) {
        ans = max(s1, t1);
    }
    else {
        if (s2 == 0) ans = t1 + t2 * n;
        else ans = s1 + s2 * n;
    }
    cout << ans << '\n';
}