#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++)cin >> a[i];
    vector<int> b(n);
    for (int i = 0; i < n; i++)cin >> b[i];

    int ret = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] != b[i]) {
            ret++;
            while (i < n && a[i] != b[i])i++;
        }
    }

    cout << ret << endl;
    return 0;
}