#include <bits/stdc++.h>
using namespace std;
#define int long long
const int INFINI = 1e18;
vector<vector<int>> recolte;
vector<int> parents;
vector<pair<int, int>> fruits;
vector<vector<int>> inverse;
vector<int> result;
int N, M, K;
void recolteFinale(int noeud, int minRencontre, vector<int>& listed) {
// cerr << noeud;
if (result[noeud] < minRencontre) {
listed[result[noeud]] += recolte[noeud][result[noeud]];
for (int iJour = 1; iJour <= K; iJour++) {
if (iJour != result[noeud]) {
listed[iJour] = max(0LL, listed[iJour]-recolte[noeud][iJour]);
}
}
minRencontre = result[noeud];
}
for (int iVoisin : inverse[noeud]) {
recolteFinale(iVoisin, minRencontre, listed);
}
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
cin >> N >> M >> K;
recolte.assign(N+1, vector<int>(K+1, 0));
parents.assign(N+1, -1);
fruits.assign(N+1, {-1, -1});
inverse.assign(N+1, vector<int>());
result.assign(N+1, -1);
for (int iArete = 2; iArete <= N; iArete++) {
cin >> parents[iArete];
inverse[parents[iArete]].push_back(iArete);
}
for (int iFruit = 1; iFruit <= M; iFruit++) {
int noeud, jour, jus;
cin >> noeud >> jour >> jus;
fruits[noeud] = {jour, jus};
}
queue<int> bfs;
vector<int> nbEnfants(N+1);
for (int i = 1; i <= N; i++) {
nbEnfants[i] = inverse[i].size();
if (inverse[i].size() == 0) bfs.push(i);
}
while (!bfs.empty()) {
int noeud = bfs.front();
bfs.pop();
if (fruits[noeud] != (pair<int, int>){-1, -1}) {
recolte[noeud][fruits[noeud].first] += fruits[noeud].second;
}
int noeudMax = 0;
for (int iJour = 1; iJour <= K; iJour++) {
if (recolte[noeud][iJour] > noeudMax) {
noeudMax = recolte[noeud][iJour];
result[noeud] = iJour;
}
}
if (parents[noeud] != 1) {
for (int iJour = 1; iJour <= K; iJour++) {
recolte[parents[noeud]][iJour] += recolte[noeud][iJour];
}
nbEnfants[parents[noeud]]--;
if (nbEnfants[parents[noeud]] == 0) bfs.push(parents[noeud]);
}
}
int resFinal = 0;
for (int iVoisin : inverse[1]) {
// cerr << iVoisin;
vector<int> vide(K+1, 0);
recolteFinale(iVoisin, INFINI, vide);
for (int i = 1; i <= K; i++) resFinal += vide[i];
}
cout << resFinal << '\n';
}
