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

int main(void){
  int n;
  cin >> n;
  vector<int> a(n), b(n);
  for (auto &x: a) cin >> x;
  for (auto &x: b) cin >> x;
  int ans = 0;
  for (int i = 0; i < n; i++) {
    if (a[i] <= b[i]) ans++;
  }
  cout << ans << endl;
  return 0;
}