#include <bits/stdc++.h>
using namespace std;
int a[6000];//对方
int bd[6000];
int b[6000];//己方
int main() {
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> b[i];
	}
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	sort(a + 1, a + n + 1);
	sort(b + 1, b + n + 1);
	bool bo = true;
	for (int i = 1; i <= n; i++) {
		if (b[i] < a[i]) {
			bo = false;
			break;
		}
	}
	if (bo) {
		cout << n;
		return 0;
	}
	int x = 1;
	for (int i = 1; i <= n; i++) {
		if (b[i] > a[1]) {
			x = i;
			break;
		}
	}
	int y = 1;
	for (int i = x; i <= n; i++) {
		bd[y] = b[i];
		y++;
	}
	y = x+1;
	for (int i = 1; i < x; i++) {
		bd[y] = b[i];
		y++;
	}
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		if (bd[i] > a[i]) {
			ans++;
		}
	}
	cout << ans;
	return 0;
}