import java.util.ArrayList;
import java.util.Scanner;

public class Main {
  public static void log(Object obj) {
    System.out.println(obj.toString());
  }

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    ArrayList<Integer> a = new ArrayList<>();
    ArrayList<Integer> b = new ArrayList<>();
    for(int i=0;i<n;i++) a.add(sc.nextInt());
    for(int i=0;i<n;i++) b.add(sc.nextInt());
    int count = 0;
    for(int i=0;i<n;i++) {
      if(a.get(i) <= b.get(i)) {
        count++;
      }
    }
    log(count);
  }
}