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