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 Ruby (2.3.3) (judge verdict: Accepted)

count = gets.to_i
count2 = count - 1
 
dishes = gets
satisfiedsB = gets
satisfiedsC = gets

dishes = dishes.split(' ')
satisfiedsB = satisfiedsB.split(' ')
satisfiedsC = satisfiedsC.split(' ')

time = 0
sum = 0
 
count.times do 
  time += 1
  if time == 1
    index = time - 1
    dish = dishes[index].to_i
    b_index = dish - 1
    b = satisfiedsB[b_index].to_i
    sum = sum + b
  else
    index = time - 1
    dish = dishes[index].to_i
    b_index = dish - 1
    b = satisfiedsB[b_index].to_i
    sum = sum + b
    
    before_index = index - 1
    before_dish = dishes[before_index].to_i
    
    if dish == before_dish + 1
      c_index = before_dish - 1
      c = satisfiedsC[c_index].to_i
      sum = sum + c
    end
  end
end
 
puts sum