import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        Set<Integer> s = new HashSet<>(), t = new HashSet<>();
        for (int i = 0; i < n; i++) {
            s.add(in.nextInt());
        }
        n = in.nextInt();
        for (int i = 0; i < n; i++) {
            t.add(in.nextInt());
        }
        s.retainAll(t);
        System.out.println(s.size());
    }
}
/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