#include <bits/stdc++.h>
using namespace std;
int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    vector<vector<int>> b(n + 1);
    vector<bool> ok(n, 0);
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) {
        int p;
        cin >> p;
        b[p].push_back(a[i]), b[a[i]].push_back(p);
    }
    int ans = 0;
    for (int i = 0; i < n; i++) {
        if (!ok[a[i]]) {
            int cnt = 0;
            queue<int> q;
            q.push(a[i]);
            ok[a[i]] = 1;
            while ((int)q.size()) {
                int hz = q.front();
                q.pop();
                cnt++;
                for (auto x : b[hz]) {
                    if (!ok[x])
                        q.push(x);
                    ok[x] = 1;
                }
            }
            ans += (cnt - 1) * 2;
        }
    }
    cout << ans << endl;
}