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

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;

int main() {
	int N;
	cin >> N;
	vector<int> a(N), b(N);
	rep(i, N) cin >> a[i];
	rep(i, N) cin >> b[i];
	int ans = 0;
	rep(i, N) {
		if(a[i] > b[i]) continue;
		ans++;
	}
	cout << ans << endl;
}