#include <bits/stdc++.h>
using namespace std;
#if __has_include("Today's/debug.cpp")
#include "Today's/debug.cpp"
#else
#define debug(...)
#define print_line
#define debugc(...)
#define cerr \
	if (false) cerr
#endif

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];
	}
	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] <= b[i]) {
			ans++;
		}
	}
	cout << ans << endl;
}