#include <bits/stdc++.h>
using namespace std;

int main() {
  int n;
  cin >> n;
  int a[n], b[n], c[n-1], 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=0;i<(n-1);++i){
    if(a[i+1]-a[i]==1) ans+=c[a[i]-1];
  }
  cout << ans << endl;
  return 0;
}