#include <iostream>
#include <vector>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint16_t N, i, A[100], B, ans = 0;
	cin >> N;
	for (i = 0; i != N; ++i) cin >> A[i];

	for (i = 0; i != N; ++i)
	{
		cin >> B;
		if (B >= A[i]) ++ans;
	}

	cout << ans << '\n';
	return 0;
}