import java.util.Scanner;
  
public class Main {
	public static void main(String[] args) {
    	Scanner s = new Scanner(System.in);
      	int n = s.nextInt();
		int[] a = new int[n];
		int[] b = new int[n];
		int[] c = new int[n - 1];
      
      	int score = 0;
      
      	for (int i = 0; i < n; i++) {
        	a[i] = s.nextInt();
        }
      
      	for (int i = 0; i < n; i++) {
        	b[i] = s.nextInt();
        }
      
      	for (int i = 0; i < n - 1; i++) {
        	c[i] = s.nextInt();
        }
      
      	int index = 0;
      	for (int i = 0; i < n; i++) {
			if (i > 0 && index == a[i] - 1) score += c[a[i] - 2];
        	score += b[a[i] - 1];
			index = a[i];
        }
      	System.out.println(score);
    }
}
/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