import java.util.Scanner;

public 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-1];
        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();
        }
        int total = 0;
        int d = 0;
        for(int i=0; i<n; i++) {
            d = a[i]-1;
            total += b[d];
            if(i != 0 && d == a[i-1]) {
                total += c[d-1];
            }
        }
        System.out.println(total);
    }
}
/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