#include <cstdio>

int main() {
    int n, a[100001], b[100001], t[131073] = {}, w;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &w);
        a[w] = i + 1;
    }
    for (int i = 0; i < n; i++) {
        scanf("%d", &w);
        b[i] = a[w];
    }
    long ans = 0;
    for (int i = 0; i < n; i++) {
        int k = b[i];
        ans += i;
        while (k) {
            ans -= t[k];
            k -= k & -k;
        }
        k = b[i];
        while (k <= 131072) {
            t[k]++;
            k += k & -k;
        }
    }
    printf("%ld\n", ans);
}