import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		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];
		int ans = 0;
		for (int i = 0;i < n;i++) {
			a[i] = sc.nextInt();
		}
		for (int i = 0;i < n;i++) {
			b[i] = sc.nextInt();
			ans += b[i];
		}
		for (int i = 0;i < n-1;i++) {
			c[i] = sc.nextInt();
		}
		for (int i = 0;i < n-1;i++) {
			if(a[i] == a[i+1] -1) {
				ans += c[a[i]-1];
			}
		}
		System.out.println(ans);
	}

}
