//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include "friend.h"
//#include "grader.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 2e6 + 5;
const double eps = 1e-9;
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(confidence[host[i]] - confidence[i], 0);
} else if (protocol[i] == 1) {
confidence[host[i]] += confidence[i];
} else {
confidence[host[i]] = max(confidence[host[i]], confidence[i]);
}
}
return confidence[0] + ans;
}
