import java.io.*;
import java.util.*;

@SpringBootApplication
public class YandexTestApplication {


    public static void main(String[] args) {
        SpringApplication.run(YandexTestApplication.class, args);
        int N;
        int K;
        int steps = 0;
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader("C:\\Users\\serge\\IdeaProjects\\YandexTest\\src\\main\\resources\\input.txt"));
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        }
        String file = null;
        try {
            file = reader.readLine();
            N = Integer.parseInt(file);
            List<Integer> list = new ArrayList<>();
            List<Integer> listval = new ArrayList<>();
            List<Integer> ref = new ArrayList<>();
            file = reader.readLine();
            String[] nums = file.split(" ");
            for (String num : nums) {
                list.add(Integer.parseInt(num));
            }
            file = reader.readLine();
            nums = file.split(" ");
            for (int i = 0; i < N; i++) {
                listval.add(Integer.parseInt(nums[i]));
            }
            file = reader.readLine();
            K = Integer.parseInt(file);
            file = reader.readLine();
            nums = file.split(" ");
            for (int i = 0; i < K; i++) {
                ref.add(Integer.parseInt(nums[i]));
            }
            int temp, temp2;
            for (int i = 0; i < K - 1; i++) {
                temp = ref.get(i);
                temp2 = ref.get(i + 1);
                if (listval.get(list.indexOf(temp)) != listval.get(list.indexOf(temp2))) {
                    steps++;
                }
            }
            try (FileWriter writer = new FileWriter("C:\\Users\\serge\\IdeaProjects\\YandexTest\\src\\main\\resources\\output.txt")) {
                writer.write(String.valueOf(steps));
                writer.flush();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }