import java.util.Scanner;

/**
 * Buffet
 */
public class Main {

    public static void main(String[] args) throws Exception {
        try (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 - 1];

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

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

            System.out.println(S);
        }
    }
}

/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