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 C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;

public class ABC0140_A2v2 {
    private static void Main(string[] args) {
        var garbage = Console.ReadLine().Trim();
        var orders = ReadIntArray();
        var satisfactionBases = ReadIntArray();
        var satisfactionCombos = ReadIntArray();
        Compute(orders, satisfactionBases, satisfactionCombos);
    }

    private static void Compute(int[] orders, int[] satisfactionBases, int[] satisfactionCombos) {
        var total = satisfactionBases.Sum();
        total += satisfactionCombos.Where((n, i) => orders[i + 1] == (orders[i] + 1)).Sum();
        OutputAnswer(total.ToString());
    }

    private static void OutputAnswer(string text) => Console.WriteLine(text);
    private static int[] ReadIntArray() => Console.ReadLine().Trim().Split().Select(x => int.Parse(x)).ToArray();
}