import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        int n = stdIn.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] = stdIn.nextInt();
        }

        for(int i = 0;i<n;i++) {
            b[i] = stdIn.nextInt();
        }

        for(int i = 0;i<n-1;i++) {
            c[i] = stdIn.nextInt();
        }

        int count = 0;

        for(int i = 0;i<b.length;i++) {
            count += b[i];
        }
        //System.out.println(count);

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