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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	var n int
	fmt.Scanf("%d", &n)

	var list [][]int

	b := true
	scanner := bufio.NewScanner(os.Stdin)

	for b {
		b = scanner.Scan()
		t := scanner.Text()
		if b == false {
			break
		}
		stringSplited := strings.Split(t, " ")
		var l []int
		for i := range stringSplited {
			var iparam int
			iparam, err := strconv.Atoi(stringSplited[i])
			if err != nil {
				return
			}
			l = append(l, iparam)
		}
		list = append(list, l)
	}

	//fmt.Printf("%v", list)

	// calc
	var point int
	for i := 0; i < n; i++ {
		point += list[1][i]

		if (i < n - 1) {
			if (list[0][i]+1 == list[0][i+1]) {
				point += list[2][list[0][i]-1]
              	//fmt.Printf(" %d ", list[0][i]-1)
			}
		}
	}
	fmt.Printf("%d", point)
}