import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int ans = 0;
    int[] A = new int[N];
    for (int i = 0; i < N; i++) A[i] = sc.nextInt();
    for (int i = 0; i < N; i++) ans += sc.nextInt();
    int[] C = new int[N - 1];
    for (int i = 0; i < N - 1; i++) C[i] = sc.nextInt();
    for (int i = 1; i < N; i++) {
      if (A[i] == A[i - 1] + 1) ans += C[A[i - 1] - 1];
    }
    System.out.println(ans);
  }
}
/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