#include "friend.h"
#include <bits/stdc++.h>
using namespace std;
typedef int INT;
#define mp make_pair
#define pb push_back
#define fst first
#define snd second
#define int long long
#define MMAX 16384
#define fast_io() ios::sync_with_stdio(false)
#define FOR(i, l, r) for(int i = (l); i < (r); i++)
typedef long long ll;
typedef pair<ll, ll> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef set<int> si;
typedef double ld;
typedef pair<ld, ld> dd;
const ll INF = 1000000000000000000LL;
const int NMAX = 1100;
const int mod = 1e9+7;
const ld eps = 1e-10;
const ld PI = acos(-1);
/*
vi match;
bitset<NMAX> vis;
vi adj[NMAX];
int aug(int n){
if(vis[n]) return 0;
vis[n] = 1;
for(int k : adj[n]) if(match[k] == -1 || aug(match[k])) {
match[k] = n;
match[n] = k;
return 1;
}
return 0;
}
int MCBM(){
int tot = 0;
FOR(i, 0, NMAX) if(match[i] == -1) vis.reset(), tot += aug(i);
return tot;
}
INT findSample(INT n, INT confidence[], INT host[], INT protocol[]){
FOR(i, 1, n){
if(protocol[i] == 0 || protocol[i] == 2){
adj[host[i]].pb(i);
adj[i].pb(host[i]);
//cout << i << " " << host[i] << endl;
}
if(protocol[i] == 1 || protocol[i] == 2){
for(int k : adj[host[i]]){
//cout << i << " " << k << endl;
adj[k].pb(i);
adj[i].pb(k);
}
}
}
match.assign(NMAX, -1);
//cout<<endl;
int m = MCBM();
FOR(i, 0, n){
cout << i << " " << match[i] << endl;
}
return n - m;
}
*/
INT findSample(INT n, INT confidence[], INT host[], INT protocol[]){
vii c;
FOR(i, 0, n) c.pb({confidence[i], 0});
for(int i = n-1; i > 0; i--) {
//cout<<i<<endl;
int h = host[i], p = protocol[i];
int p1 = c[h].fst, q1 = c[h].snd,
p2 = c[i].fst, q2 = c[i].snd;
if(p == 0) c[h] = { p1 + q2, max(p2 + q1, q2 + q1) };
if(p == 1) c[h] = { max(max(p1 + p2, p1 + q2), p2 + q1), q1 + q2 };
if(p == 2) c[h] = { max(p1 + q2, p2 + q1), q1 + q2 };
}
//<<c[0].fst<<endl;
return max(c[0].fst, c[0].snd);
}
/*
signed main(){
fast_io();
int N;
INT conf[NMAX], host[NMAX], protocol[NMAX];
cin >> N;
FOR(i, 0, N) cin >> conf[i];
FOR(i, 1, N) cin >> host[i], cin >> protocol[i];
cout << findSample(N, conf, host, protocol) << endl;
}
6
13 3 6 20 10 15
0 0
0 1
1 2
2 1
0 0
*/
