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: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;



namespace ConsoleApplication2
{

    class Program
    {
        static void Main(string[] args)
        {


            //int  postition=0,range=0;
            string[] eatmass = Console.ReadLine().Split(' ');
            string[] mass = Console.ReadLine().Split(' ');

            string[] greed = Console.ReadLine().Split(' ');
            string[] bonus = Console.ReadLine().Split(' ');

            int[] pointlist = new int[mass.Length];
            int Eatmass = int.Parse(eatmass[0]);

            for (int i = 0; i < Eatmass; i++)
            {
                pointlist[i] = int.Parse(mass[i]);
            }

            int[] greedlist = new int[greed.Length];
            for (int i = 0; i < Eatmass; i++)
            {
                greedlist[i] = int.Parse(greed[i]);
            }

            int[] bonuslist = new int[bonus.Length];
            for (int i = 0; i < bonus.Length; i++)
            {
                bonuslist[i] = int.Parse(bonus[i]);
            }

            int result = 0,eaten=0;

            for(int i=0;i< Eatmass; i++)
            {

                result += greedlist[pointlist[i]-1];
               
                if(eaten!=0)
                {
                    if(pointlist[i]  == eaten+1)
                    {
                        result += bonuslist[eaten-1];
                    }
                }
                eaten = pointlist[i];

            }
            //int[] listinput = new int[mass.Length];

            //for (int i = 0; i < mass.Length; i++)
            //{
            //    listinput[i] = int.Parse(mass[i]);
            //}


            Console.Write(result);



            //postition = int.Parse(mass[1]);

            //int nowposition = postition - (range - 1);

            //for(int i= 0; i<=(range-1)*2;i++)
            //{

            //    Console.Write(nowposition);
            //    Console.Write(" ");
            //    nowposition++;
            //}

            result = 0;

        }
    }
}