import java.util.Arrays;
import java.util.HashSet;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		scanner.nextLine();
		HashSet<String> set1 = new HashSet<>(Arrays.asList(scanner.nextLine().split(" ")));
		scanner.nextLine();
		int count=0;
		for(String str: scanner.nextLine().split(" ")) {
			if(set1.contains(str)) {
				count++;
			}
		}
		System.out.println(count);

	}

}


/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