#include <iostream>
using namespace std;

int main(void){
//input
	int N; cin >> N;
	int kitai[N]; for (int i = 0; i < N; i++) { cin >> kitai[i]; }
	int manz[N];  for (int i = 0; i < N; i++) { cin >> manz[i]; }
//calc
	int sum = 0;
	for (int i = 0; i < N; i++) {
		if(kitai[i] <= manz[i]) ++sum;
	}
//output
	cout << sum << endl;
}