Problem:
Score : 200 points

Problem Statement

Takahashi went to an all-you-can-eat buffet with N kinds of dishes and ate all of them (Dish 1, Dish 2, \ldots, Dish N) once.

The i-th dish (1 \leq i \leq N) he ate was Dish A_i.

When he eats Dish i (1 \leq i \leq N), he gains B_i satisfaction points.

Additionally, when he eats Dish i+1 just after eating Dish i (1 \leq i \leq N - 1), he gains C_i more satisfaction points.

Find the sum of the satisfaction points he gained.

Constraints

All values in input are integers.

2 \leq N \leq 20

1 \leq A_i \leq N

A_1, A_2, ..., A_N are all different.

1 \leq B_i \leq 50

1 \leq C_i \leq 50

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 ... A_N
B_1 B_2 ... B_N
C_1 C_2 ... C_{N-1}

Output

Print the sum of the satisfaction points Takahashi gained, as an integer.

Sample Input 1

3
3 1 2
2 5 4
3 6

Sample Output 1

14

Takahashi gained 14 satisfaction points in total, as follows:

First, he ate Dish 3 and gained 4 satisfaction points.

Next, he ate Dish 1 and gained 2 satisfaction points.

Lastly, he ate Dish 2 and gained 5 + 3 = 8 satisfaction points.

Sample Input 2

4
2 3 4 1
13 5 8 24
45 9 15

Sample Output 2

74

Sample Input 3

2
1 2
50 50
50

Sample Output 3

150

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		int all = 0;
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] c = new int[N-1];
		
		ArrayList<Integer> CN = new ArrayList<>();
		
		int check, checkB = 0;
		checkB = sc.nextInt();
		
		for(int i = 0; i < N-1; i++) {
			check = sc.nextInt();
			if(checkB == (check-1)) {
				CN.add(checkB);
			}
			checkB = check;
		}
		
		for(int j = 0; j < N; j++) {
			all = all + sc.nextInt();
		}
		
		Collections.sort(CN);
		for(int k = 0; k < N-1; k++) {
			c[k] = sc.nextInt();
		}
		
		for(int l = 0; l < CN.size(); l++) {
			all = all + c[CN.get(l)-1];
		}
		
		System.out.println(all);
	}
}