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 JavaScript (node.js v5.12) (judge verdict: Accepted)

// inputに入力データ全体が入る

function Main(input) {
    input = input.split("\n")
    N = input[0]
    inputA = input[1].split('\r')[0].split(' ')
    inputB = input[2].split('\r')[0].split(' ')
    inputC = input[3].split('\r')[0].split(' ')
    var count = 0

    for(var i=0; i < N;i++){
//        console.log( " inputB[ inputA[i] - 1 ]:::" ,  inputB[ inputA[i] - 1 ]  )
        count += parseInt( inputB[ inputA[i] - 1 ] );
        if( i > 0   ){
         //   console.log( inputA[i-1]  ,inputA[i]  )

            if( inputA[i-1] == inputA[i] -1  ){
                count += parseInt( inputC[  inputA[i-1] -1  ])
//console.log("inputC[i-1]:::",inputC[  inputA[i-1] -1   ])
            }
        }
    }
    console.log(count)
}


//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）

Main(require("fs").readFileSync("/dev/stdin", "utf8"))