#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

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;

  return 0;
}