#include "friend.h"
#include<bits/stdc++.h>
using namespace std;
// Find out best sample
const int MAXN = 1e5 + 10;
vector<int> grafo[MAXN];
int dp[MAXN][5], v[MAXN], comp[MAXN], maxc[MAXN];
void dfsc(int x, int p, int c){
comp[x] = c;
for(int v : grafo[x]){
if(v == p) continue;
dfsc(v, x, c);
}
}
void dfs(int x, int p){
dp[x][0] = 0, dp[x][1] = v[x];
for(int v : grafo[x]){
if(v == p) continue;
dfs(v, x);
dp[x][0] += max(dp[v][0], dp[v][1]);
dp[x][1] += dp[v][0];
}
}
int findSample(int n,int confidence[],int host[],int protocol[]){
int ans= 0;
for(int i = 0; i < n; i++) v[i] = confidence[i];
for(int i = 1; i < n; i++){
grafo[host[i]].push_back(i);
grafo[i].push_back(host[i]);
}
int c = 0;
for(int i = 0; i < n; i++){
if(!comp[i]){
dfsc(i,i, ++c);
}
}
for(int i = 0; i < n; i++){
dfs(i, i);
maxc[comp[i]] = max(maxc[comp[i]], dp[i][1]);
}
for(int i = 1; i <= c; i++) ans += maxc[i];
return ans;
}
