
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		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];

			//Input

			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();
			}

			//けーさん
			int ans = 0;
			for(int i = 0; i < n; i++) {
				ans +=b[a[i] - 1];
			}
			for(int i = 0; i < n -1; i++) {
				if(a[i] + 1 == a[i+1]) {
					ans += c[a[i] - 1];
				}
			}



			System.out.println(ans);
		}
	}

}

/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