using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace foryuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int Nw = int.Parse(Console.ReadLine());
            int[] W = ConvertStringArrayToIntArray(Console.ReadLine().Split());
            int Nb = int.Parse(Console.ReadLine());
            int[] B = ConvertStringArrayToIntArray(Console.ReadLine().Split());


            int cnt1 = 0;
            int Wm = 0;
            int Bm = 0;

            while (true)
            {
                var q = from x in W
                        where x > Bm
                        orderby x
                        select x;

                if (q.Count() != 0)
                {
                    Wm = q.Min();
                    cnt1++;
                }
                else
                {
                    break;
                }

                var p = from x in B
                        where x > Wm
                        orderby x
                        select x;

                if (p.Count() != 0)
                {
                    Bm = p.Min();
                    cnt1++;
                }
                else
                {
                    break;
                }
            }

            //---------------------------

            int cnt2 = 0;
            Wm = 0;
            Bm = 0;

            while (true)
            {
                var p = from x in B
                        where x > Wm
                        orderby x
                        select x;

                if (p.Count() != 0)
                {
                    Bm = p.Min();
                    cnt2++;
                }
                else
                {
                    break;
                }

                var q = from x in W
                        where x > Bm
                        orderby x
                        select x;

                if (q.Count() != 0)
                {
                    Wm = q.Min();
                    cnt2++;
                }
                else
                {
                    break;
                }
            }

            Console.WriteLine(Math.Max( cnt1,cnt2));

        }


        //-------------------------------------------------------------

        static int[] ConvertStringArrayToIntArray(string[] str)
        {
            int[] b = Array.ConvertAll<string, int>(str, delegate(string value)
                {
                    return int.Parse(value);
                });
            return b;
        }

        static List<int> ConvertStringArrayToIntList(string[] str)
        {
            var list = new List<int>();
            foreach (var c in str)
            {
                list.Add(int.Parse(c));
            }
            return list;
        }
    }
}