using System.Collections;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

internal class Program
{
    private const long mod = 998244353;
    private const long mod17 = 1000000007;
    
    public static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        var a = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        var b=Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        int ans = 0;
        for(int i=0;i<n;i++)
            if (a[i] <= b[i])
                ans++;
        Console.WriteLine(ans);
    }
    public class lower_bound<T> : IComparer<T> where T : IComparable<T>
    {
        public int Compare(T x, T y)
        {
            return 0 <= x.CompareTo(y) ? 1 : -1;
        }
    }
    public static List<int> mkar(int n, int val)
    {
        List<int> res = new List<int>(n);
        for(int i=0;i<n;i++)res.Add(val);
        return res;
    }
   
}