#include "bits/stdc++.h"
using namespace std;


int main() {
	int N; cin >> N;
	vector<int>a(N), b(N);
	for (int i = 0; i < N; i++)cin >> a[i];
	for (int i = 0; i < N; i++)cin >> b[i];
	sort(a.begin(), a.end());
	long long ans = 0;
	for (int i = 0; i < N; i++) {
		int idx = upper_bound(a.begin(), a.end(), b[i]) - a.begin();
		idx = max(idx, i);
		ans += N - idx;
	}
	cout << ans << endl;
}