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