#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  int a[n], b[n], c[n];
  int sum = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for (int i = 0; i < n; i++) {
    cin >> b[i];
    sum += b[i];
  }
  for (int i = 0; i < n; i++) {
    cin >> c[i];
  }
  for (int i = 1; i < n; i++) {
    if (a[i] - a[i - 1] == 1) sum += c[a[i - 1] - 1];
  }
  cout << sum;
  return 0;
}
