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