import java.util.*;

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

		n = sc.nextInt();
		int[] nums = new int[n];
		for (int i = 0; i < n; i++) {
			nums[i] = sc.nextInt();
		}

		n = sc.nextInt();
		for (int i = 0; i < n; i++) {
			tmp = sc.nextInt();
			if (Arrays.binarySearch(nums, tmp) >= 0) {
				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