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