using System;
using System.Collections.Generic;
using System.Text;
using sc = Scanner;
using System.Collections;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        Solve();
#if DEBUG
        Console.WriteLine("終了するにはなにかキーを押して下さい...");
        Console.ReadKey();
#endif

    }

    static void Solve()
    {
        int na = sc.NextInt();
        int[] w = sc.NextIntArray();
        int nb = sc.NextInt();
        int[] b = sc.NextIntArray();
        Array.Sort(w, (x, y) => y - x );
        Array.Sort(b, (x, y) => y - x );
        int l = Count(w, b, 0, 0); // sudeni b[0] wo tunda to suru
        int m = Count(b, w, 0, 0); // sudeni w[0] wo tunda to suru
        Console.WriteLine(Math.Max(l, m));


#if DEBUG
        Console.WriteLine("local check"); // Visual Studioのローカル変数チェック用 MainにいくとSolve内のローカル変数消えちゃう
#endif 
    }

    public static int Count(int[] start, int[] second, int startCount, int secondCount)
    {
        int p = 1;
        for (int i = startCount; i < start.Length; i++)
        {
            if (start[i] < second[secondCount])
            {
                p += Count(second, start, secondCount, i);
                break;
            }
        }
        return p;
    }

 }


public static class Scanner
{
    public static string[] NextStrArray()
    {
        return Console.ReadLine().Split(' ');
    }

    public static long[] NextLongArray()
    {
        string[] s = NextStrArray();
        long[] a = new long[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = long.Parse(s[i]);
        }
        return a;
    }
    public static int[] NextIntArray()
    {

        string[] s = NextStrArray();
        int[] a = new int[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = int.Parse(s[i]);
        }
        return a;
    }
    public static int NextInt()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return int.Parse(tmp);
    }
    public static double NextDouble()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return double.Parse(tmp);
    }
    public static long NextLong()
    {
        string tmp = "";
        while (true)
        {
            string readData = char.ConvertFromUtf32(Console.Read());
            if (readData == " " || readData == "\n")
                break;
            tmp += readData;
        }
        return long.Parse(tmp);
    }
    public static double[] NextDoubleArray()
    {

        string[] s = NextStrArray();
        double[] a = new double[s.Length];
        for (int i = 0; i < a.Length; i++)
        {
            a[i] = double.Parse(s[i]);
        }
        return a;
    }
}