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)

// #define CPP_IO

#pragma region

#include <bits/stdc++.h>
using namespace std;
using ii = pair<int, int>;
using ll = long long;
using vi = vector<int>;
template <typename T>
using minheap = priority_queue<T, vector<T>, greater<T>>;
template <typename T>
using maxheap = priority_queue<T>;

#define f first
#define s second

#ifdef LOCAL
#define debug cout
#define debugf(format, ...) printf(format, ##__VA_ARGS__)
#else
#define debug \
    if (0) cout
#define debugf(format, ...) 42
#endif

#define DUMP(a) debug << #a " = " << (a) << "\n";
#define DUMP2(a, b) debug << #a " = " << (a) << " " #b " = " << (b) << "\n";
#define DUMP3(a, b, c) debug << #a " = " << (a) << " " #b " = " << (b) << " " #c " = " << (c) << "\n";
#define DUMP4(a, b, c, d) debug << #a " = " << (a) << " " #b " = " << (b) << " " #c " = " << (c) << " " #d " = " << (d) << "\n";

template <typename T>
ostream& operator<<(ostream& os, vector<T> v) {
    os << "[ ";
    for (auto e : v) os << e << " ";
    return os << "]";
}

template <typename T, typename V>
ostream& operator<<(ostream& os, set<T, V> v) {
    os << "{ ";
    for (auto e : v) os << e << " ";
    return os << "}";
}

template <typename T, typename V, typename S>
ostream& operator<<(ostream& os, map<T, V, S> v) {
    os << "{ ";
    for (auto e : v) os << e << " ";
    return os << "}";
}

template <typename T, typename V>
ostream& operator<<(ostream& os, pair<T, V> x) {
    return os << "( " << x.first << ", " << x.second << " )";
}

template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for (auto& e : v) is >> e;
    return is;
}

template <typename T, typename V>
istream& operator>>(istream& is, pair<T, V>& x) {
    return is >> x.first >> x.second;
}

void solve();

int main() {
#ifdef LOCAL
    freopen("data.txt", "r", stdin);
#else
#ifdef CPP_IO
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif
#endif
    solve();
}

#pragma endregion

void solve() {
    int n;
    cin >> n;
    vector<int> a(n), b(n), c(n);
    cin >> a >> b >> c;
    int sum = 0;
    for (int i = 0; i < n; ++i) {
        --a[i];
        sum += b[a[i]];
    }
    for (int i = 0; i < n - 1; ++i) {
        if (a[i + 1] == a[i] + 1) {
            DUMP(i);
            sum += c[a[i]];
        }
    }
    cout << sum << "\n";
}