import java.math.*;
import java.util.*;

class Main {
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PriorityQueue<Integer> siro = new PriorityQueue<>();
        PriorityQueue<Integer> kuro = new PriorityQueue<>();
        int nw = sc.nextInt();
        for(int i=0;i<nw;i++){
        	int aaaa=sc.nextInt();
        	siro.offer(-aaaa);
        }
        PriorityQueue<Integer> siro1 = new PriorityQueue<>(siro);
        int nb=sc.nextInt();
        for (int i = 0; i <nb; i++) {
        	int aaaa=sc.nextInt();
        	kuro.offer(-aaaa);
		}

        PriorityQueue<Integer> kuro1 = new PriorityQueue<>(kuro);
        int ans=1;
        int count1=1;
    	int now=-1*siro.poll();
        while(!kuro.isEmpty() || !siro.isEmpty()){
        	int bb=0;
        	while(!kuro.isEmpty()){
        		bb=-1*kuro.poll();
        		if(bb<now) break;
        	}
	        if(now>bb){ 
	        	now=bb;
	        	count1++;
	        }else{
	        	break;
	        }
	        int aa=0;
	        if(siro.isEmpty())break;
	        while(!siro.isEmpty()){
	        	aa=-1*siro.poll();
	        	if(now>aa)break;
	        }
	        if(now>aa){
	        	now=aa;
	        	count1++;
	        }else{
	        	break;
	        }
	     }
        ans=count1;
        int count2=1;
        int now1=-1*kuro1.poll();
        while(!kuro1.isEmpty() || !siro1.isEmpty()){
        	int bb=0;
        	while(!siro1.isEmpty()){
        		bb=-1*siro1.poll();
        		if(bb<now1) break;
        	}
	        if(now1>bb){ 
	        	now1=bb;
	        	count2++;
	        }else{
	        	break;
	        }
	        int aa=0;
	        if(kuro1.isEmpty()) break;
	        while(!kuro1.isEmpty()){
	        	aa=-1*kuro1.poll();
	        	if(aa<now1) break;
	        }
	        if(now1>aa){
	        	now1=aa;
	        	count2++;
	        }else{
	        	break;
	        }
	     }
        	ans=Math.max(ans, count2);
        	System.out.println(ans);
    }
}