#include <iostream>
#include <vector>
#include <set>
#include "friend.h"
using namespace std;
const int MAXN = 1e3+5;
bool visited[MAXN];
bool visited2[MAXN];
int val[MAXN];
vector<int> v1[MAXN];
int first;
set<int> s1;
int dprotocol[MAXN][6];
int findSample(int n, int confidence[], int host[], int protocol[]){
int ans = 0;
for(int i=n-1;i>=0;i--){
if(protocol[i] == 0){
ans+=confidence[i];
confidence[host[i]] = max(0,confidence[host[i]]-confidence[i]);
}
if(protocol[i] == 1){
confidence[host[i]] += confidence[i];
}
if(protocol[i] == 2){
confidence[host[i]] = max(confidence[host[i]],confidence[i]);
}
}
return ans+confidence[0];
}