import java.util.*;

public class Main{
	public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
    int cnt = 0;
		int[] num = new int[n];

		for(int i=0; i< n;i++) {
			num[i] = sc.nextInt();
		}
    int m = sc.nextInt();
		for(int i = 0;i<m;i++) {
			int a = sc.nextInt();
			if (Arrays.binarySearch(num, a) > -1)
				cnt++;
		}
		System.out.println(cnt);
  }
}

/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