import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        HashSet<Integer> S = new HashSet<>();
        for(int i = 0;i < n;i++){
            S.add(sc.nextInt());
        }
        
        int q = sc.nextInt();
        int count = 0;
        for(int i = 0;i < q;i++){
            if(S.contains(sc.nextInt()))    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