import java.util.Scanner;

public class Main {
	static int[] boo = new int[100000];
	public static void main(String[] args)throws Exception{
		//BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		Scanner sc = new Scanner(System.in);
		
		int n = Integer.parseInt(sc.next());
		//String[] st = br.readLine().split(" ");
		//boolean[] boo = new boolean[100000];
		
		for (int i = 0; i < n; i++) {
			//boo[Integer.parseInt(st[i])%100000] = 1;
			boo[Integer.parseInt(sc.next())%100000] = 1;
		}
		
		int ans = 0;
		//n = Integer.parseInt(br.readLine());
		n = Integer.parseInt(sc.next());
		//st = br.readLine().split(" ");
		for (int i = 0; i < n; i++) {
//			ans += boo[Integer.parseInt(st[i])%100000] ;
			ans += boo[Integer.parseInt(sc.next())%100000] ;
		}
		System.out.println(ans);
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz