import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = Integer.parseInt(sc.next()); 
    int[] A = new int[N];
    int[] B = new int[N];
    int[] C = new int[N-1];

    for (int i=0; i < N; i++) {
        A[i] = Integer.parseInt(sc.next()); 
    }
    for (int i=0; i < N; i++) {
        B[i] = Integer.parseInt(sc.next()); 
    }
    for (int i=0; i < N - 1; i++) {
        C[i] = Integer.parseInt(sc.next()); 
    }
    int sum = 0;
    for(int i=0; i < N; i++){
        sum += B[A[i]-1];
        if(i>=1&&i<N){
            if(A[i] - A[i-1] ==1){
                sum += C[A[i-1]-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