
import java.util.Scanner;

/**
 * @author author
 *
 */
public class Main {

  /**
   * @param args
   */
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.next());

    int[] a = new int[n];
    for (int i = 0; i < n; i++) {
      a[i] = Integer.parseInt(sc.next());
    }

    int[] b = new int[n];
    for (int i = 0; i < n; i++) {
      b[i] = Integer.parseInt(sc.next());
    }

    int[] c = new int[n - 1];
    for (int i = 0; i < n - 1; i++) {
      c[i] = Integer.parseInt(sc.next());
    }
    
    int score = 0;
    for (int i = 0; i < n; i++) {
      score += b[a[i] - 1];
      if(i > 0) {
        if (a[i] - a[i - 1] == 1) {
          score += c[a[i - 1] - 1];
        }
      }
    }
    
    System.out.println(score);
  }

}

/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