
import java.util.*;
import java.lang.*;

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();
        }
        for(int i = 0; i < N-1; i++){
            C[i] = sc.nextInt();
        }
        sum +=  B[A[0]-1];

        for(int i = 1; i < N; i++){
            sum +=  B[A[i]-1];
            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