package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)
var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func main() {
	sc.Split(bufio.ScanWords)
	w := nextInt()
	ws := make([]int, w)
	for i := range ws {
		ws[i] = nextInt()
	}

	b := nextInt()
	bs := make([]int, b)
	for i := range bs {
		bs[i] = nextInt()
	}
	sort.Sort(sort.IntSlice(ws))
	sort.Sort(sort.IntSlice(bs))

	wb := []*[]int{&ws, &bs}
	counts, ends := []int{0, 0}, []int{21, 21}
	for i := 0; i < 2; i++ {
		for j := 0; j < 20; j++ {
			blocks := wb[j%2]
			if len(*blocks) == 0 || (*blocks)[0] >= ends[i] {
				break
			}

			for k := len(*blocks) - 1; k >= 0; k-- {
				if (*blocks)[k] < ends[i] {
					counts[i]++
					ends[i] = (*blocks)[k]
					*blocks = (*blocks)[:k]
					break
				}
			}
		}
		ws, bs = ws[:w], bs[:b]
		wb = []*[]int{&bs, &ws}
	}

	if counts[0] > counts[1] {
		fmt.Println(counts[0])
		return
	}
	fmt.Println(counts[1])
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}