package yukicoder;
import java.util.Arrays;
import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		new Main().solve();
	}
	void solve(){
		Scanner sc=new Scanner(System.in);
		int nw=sc.nextInt();
		int[] w=new int[nw];
		for(int i=0;i<nw;i++){
			w[i]=sc.nextInt();
		}
		int nb=sc.nextInt();
		int[] b=new int[nb];
		for(int i=0;i<nb;i++){
			b[i]=sc.nextInt();
		}
		Arrays.sort(w);Arrays.sort(b);
		int res=0;
		for(int t=0;t<2;t++){
			int i=w.length-1;
			int j=b.length-1;
			int k=1000;
			int tmp=0;
			for(;;){
				while(i>=0&&w[i]>=k)i--;
				if(i<0)break;
				k=w[i];tmp++;i--;

				while(j>=0&&b[j]>=k)j--;
				if(j<0)break;
				k=b[j];tmp++;j--;
			}
			res=Math.max(res, tmp);
			int[] d=w;w=b;b=Arrays.copyOf(d,d.length);
		}
		System.out.println(res);
	}
}