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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>//solved by *ALIKHAN*
#define ll long long
#define ld long double
#define pb push_back
#define sz(x) (int)x.size()
#define F first
#define S second
#define ppb pop_back
#define mp make_pair
#define all(n) n.begin(), n.end()
#define timefaster ios_base::sync_with_stdio(0);cin.tie(0)

using namespace std;

const int N = (int)2e5 + 123;
const int mod = (int)1e9 + 7;
const ll INF = (ll)1e18;
int a[N] , b[N] , c[N] , sum;
int main(){
	timefaster;
	int n ;
	cin >> n;
	for(int i = 0;i < n;i ++){
	 	cin >> a[i];
	 	a[i] --;
	}
	for(int i = 0;i < n;i ++) cin >> b[i];
	for(int i = 0;i < n - 1;i ++) cin >> c[i];
	for(int i = 0;i < n;i ++){
		sum += b[a[i]];
		if(i > 0 && a[i] == a[i - 1] + 1) sum += c[a[i - 1]];  	
	}
	cout << sum;
}// Aksay sila