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)

fn read<T: std::str::FromStr>(
    stdin_lock: &mut std::io::StdinLock,
    buf: &mut Vec<u8>,
    delimiter: u8,
) -> T {
    buf.clear();
    let l = std::io::BufRead::read_until(stdin_lock, delimiter, buf).unwrap();
    buf.truncate(l - 1); // remove delimiter
    let s = unsafe { std::str::from_utf8_unchecked(&buf) };
    s.parse().unwrap_or_else(|_| panic!("read"))
}

fn main() {
    let stdin = std::io::stdin();
    let mut stdin_lock = stdin.lock();
    let mut buf: Vec<u8> = Vec::new();
    let n: usize = read(&mut stdin_lock, &mut buf, b'\n');
    let mut av = vec![0usize; n];
    for i in 0..n - 1 {
        av[i] = read(&mut stdin_lock, &mut buf, b' ');
    }
    av[n - 1] = read(&mut stdin_lock, &mut buf, b'\n');
    let mut bv = vec![0i32; n];
    for i in 0..n - 1 {
        bv[i] = read(&mut stdin_lock, &mut buf, b' ');
    }
    bv[n - 1] = read(&mut stdin_lock, &mut buf, b'\n');
    let mut cv = vec![0i32; n - 1];
    for i in 0..n - 2 {
        cv[i] = read(&mut stdin_lock, &mut buf, b' ');
    }
    cv[n - 2] = read(&mut stdin_lock, &mut buf, b'\n');

    let mut ans = 0;
    for i in 0..n - 1 {
        let curr = av[i] - 1;
        let next = av[i + 1] - 1;
        ans += bv[curr] + if next == curr + 1 { cv[curr] } else { 0 };
    }
    ans += bv[av[n - 1] - 1];
    println!("{}", ans);
}