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