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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String args[]) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		solver.readA(in.readLine());
		solver.readB(in.readLine());
		solver.readC(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		solver.solve();
	}
}

class Solver {
	int N;
	int cnt;

	public void init() {
		N = 0;
		cnt = 0;
	}

	public void readHead(String str) {
		String[] strArr = str.split("\\s+");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		A = new int[N + 1];
		B = new int[N + 1];
		C = new int[N + 1];
	}

	public void readA(String str) {
		String[] strArr = str.split("\\s+");
		for (int i = 0; i < N; i++)
			A[i + 1] = Integer.parseInt(strArr[i]);
	}

	public void readB(String str) {
		String[] strArr = str.split("\\s+");
		for (int i = 0; i < N; i++)
			B[i + 1] = Integer.parseInt(strArr[i]);
	}

	public void readC(String str) {
		String[] strArr = str.split("\\s+");
		for (int i = 0; i < N - 1; i++)
			C[i + 1] = Integer.parseInt(strArr[i]);
	}

	int[] A;
	int[] B;
	int[] C;

	public boolean hasNext() {
		return cnt < N;
	}

	public void readBody(String str) {
		// System.out.println(str);
		cnt++;
	}

	public void solve() {
		int ans = 0;
		for (int i = 1; i <= N; i++) {
			ans += B[A[i]];
			if (i >= N)
				continue;
			if (A[i] + 1 == A[i + 1])
				ans += C[A[i]];
		}
		System.out.println(ans);
	}
}