using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    public void Solve()
    {
        int Rounds = Reader.Int();
        int NA = Reader.Int();
        var A = Reader.IntArray(NA);
        int NB = Reader.Int();
        var B = Reader.IntArray(NB);
        List<int> a = new List<int>(), b = new List<int>();
        int ans = 0;

        for (int r = 0; r < Rounds; r++)
        {
            if (a.Count == 0) a = A.OrderBy(v => v).ToList();
            if (b.Count == 0) b = B.OrderByDescending(v => v).ToList();
            Fight(a, b, ref ans);
        }

        Console.WriteLine(ans);
    }

    private void Fight(List<int> a, List<int> b, ref int ans)
    {
        for (int ai = 0; ai < a.Count; ai++)
            for (int bi = 0; bi < b.Count; bi++)
                if (a[ai] > b[bi])
                {
                    ans++;
                    a.RemoveAt(ai);
                    b.RemoveAt(bi);
                    return;
                }
        a.RemoveAt(0);
        b.RemoveAt(0);
    }



}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}