import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list_gold=new ArrayList<Integer>();
		//Integer[] Republican = new Integer[m];
		List<Integer> list_jun=new ArrayList<Integer>();
		List<Integer> list_tuika=new ArrayList<Integer>();
		int manzoku=0;

		int n = sc.nextInt();

		for(int i=0;n>i;i++) {
			int a = sc.nextInt();
			list_jun.add(a);
		}

		for(int i=0;n>i;i++) {
			int a = sc.nextInt();
			manzoku=manzoku+a;
		}
		for(int i=0;n-1>i;i++) {
			int a = sc.nextInt();
			list_tuika.add(a);
		}
		for(int i=0;n-1>i;i++) {
			if(list_jun.get(i)+1==list_jun.get(i+1))
				manzoku=manzoku+list_tuika.get(list_jun.get(i)-1);
		}

		System.out.println(manzoku);


	}

}
/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