#include <cstdio>

int main() {
    int n, a[100000], b[100000], w;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &w);
        a[w - 1] = i;
    }
    for (int i = 0; i < n; i++) {
        scanf("%d", &w);
        b[i] = a[w - 1];
    }
    long ans = 0;
    for (int i = 1; i < n; i++) {
        for (int j = 0; j < i; j++) {
            if (b[j] > b[i]) ans++;
        }
    }
    printf("%ld\n", ans);
}