#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }


constexpr Int INF = 1001001001001001001LL;

int N, K;
vector<int> P;
vector<Int> C, W;

Int ans;

namespace sub2 {
void run() {
  assert(K == N - 1);
  // 0: same color as root
  for (int s = 0; s < 2; ++s) {
    Int crt[2] = {INF, INF};
    crt[s] = (0 == s) ? C[0] : 0;
    for (int i = 1; i < K; ++i) {
      Int nxt[2] = {INF, INF};
      for (int x = 0; x < 2; ++x) for (int y = 0; y < 2; ++y) {
        chmin(nxt[y], crt[x] + ((x == y) ? W[i - 1] : 0) + ((0 == y) ? C[i] : 0));
      }
      copy(nxt, nxt + 2, crt);
    }
    for (int x = 0; x < 2; ++x) {
      chmin(ans, crt[x] + ((x == s) ? W[K - 1] : 0));
    }
  }
}
}  // sub2

long long place_police(vector<int> P_, vector<long long> C_, vector<long long> W_) {
  P = P_;
  C = C_;
  W = W_;
  N = (int)P.size() + 1;
  K = W.size();
  ans = INF;
  if (P == vector<int>(N - 1, 0)) {
    sub2::run();
  }
  return ans;
}