import java.util.*;
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[] a = new int[n];
    int[] b = new int[n];
    int[] c = new int[n];
    int sum = 0 ;

    for (int i = 0 ; i < n ; i++ ) {
      a[i] = sc.nextInt();
    }

    for (int i = 0 ; i < n ; i++ ) {
      b[i] = sc.nextInt();
      sum += b[i];
    }

    for (int i = 0 ; i < n-1 ; i++ ) {
      c[i] = sc.nextInt();
    }

    for (int i = 0 ; i < n-1 ; i++ ) {
      if (a[i+1] + a[i] == 1) {
        sum += c[a[i]-1];
      }
    }

    System.out.println(sum);
    }
}
