import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        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] = scanner.nextInt();
        for (int i = 0; i < N; i++) B[i] = scanner.nextInt();
        for (int i = 0; i < N - 1; i++) C[i] = scanner.nextInt();

        int res = B[A[0] - 1];
        for (int i = 1; i < A.length; i++) {
            res += B[A[i] - 1];
            if (A[i] - A[i - 1] == 1) res += C[A[i - 1] - 1];
        }

        System.out.println(res);
    }
}

/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