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 Rust (1.15.1) (judge verdict: Accepted)

use std::io::*;
use std::str::FromStr;

#[test]
fn test() {
    // apend to test here
//    assert_eq!();
}

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
            .bytes()
            .map(|c| c.expect("failed to read char") as char)
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect();
    token.parse().ok().expect("failed to parse token")
}

fn func(n: usize, a: Vec<u32>, b: Vec<u32>, c: Vec<u32>) -> u32 {
    let mut ans = 0;
    let mut tmp: u32 = (n + 1) as u32;
    for i in a {
        ans = ans + b[(i - 1) as usize];
        if i == (tmp + 1) {
            ans = ans + c[(tmp - 1) as usize];
        }
        tmp = i;
    }
    ans
}
fn main() {
    // Add variable
    let n: usize = read();
    let mut a = Vec::new();
    for _i in 0..n {
        a.push(read::<u32>());
    }
    let mut b = Vec::new();
    for _i in 0..n {
        b.push(read::<u32>());
    }
    let mut c = Vec::new();
    for _i in 0..(n-1) {
        c.push(read::<u32>());
    }
    let ans;

    ans = func(n, a, b, c);
    println!("{}", ans);
}