//
// main.cpp
// IntensiveCamp 1 2026
//
// Created by Ali AlSalman on 27/04/2026.
//
#include <bits/stdc++.h>
#pragma GCC target("popcnt")
//#define INTERACTIVE
//#define TESTCASES
//#define SPOJ_BULLSCHEI__SZ__E__KIJETESANPAKALU__
#ifndef INTERACTIVE
#define endl '\n'
#endif
template<typename T>
using vec = std::vector<T>;
using namespace std;
struct G {
int size;
vec<vec<int>> adj;
G(int n) : size(n), adj(n) {}
void undirectedAdd(int i, int j) {
adj[i].push_back(j);
adj[j].push_back(i);
}
};
typedef map<int, int> darr;
darr* merge(darr* a, darr* b) {
if (a->size() > b->size()) swap(a, b);
for (auto [k, v] : *a)
(*b)[k] += v;
delete a;
return b;
}
vec<darr::iterator> to_remove;
void dfs(int u, int p, G& g, vec<darr*>& dp, vec<array<int, 2>>& f) {
dp[u] = new darr;
for (auto c : g.adj[u]) if (c != p) {
dfs(c, u, g, dp, f);
dp[u] = merge(dp[u], dp[c]);
}
auto [d, w] = f[u];
(*dp[u])[d] += w;
for (auto it = next(dp[u]->find(d)); w && it != dp[u]->end(); ++it) {
if (it->second > w) { it->second -= w; break; }
w -= it->second;
to_remove.push_back(it);
}
while (!to_remove.empty()) {
dp[u]->erase(to_remove.back());
to_remove.pop_back();
}
}
void solve() {
int n, m, k;
cin>>n>>m>>k;
G g(n);
for (int i = 1; i < n; i++) {
int j;
cin>>j; j--;
g.undirectedAdd(i, j);
}
vec<array<int, 2>> f(n);
while (m--) {
int a, b, c;
cin>>a>>b>>c; a--;
f[a] = {b, c};
}
vec<darr*> dp(n);
dfs(0, -1, g, dp, f);
long long ans = 0;
for (auto [t, v] : *dp[0]) {
if (k < t) break;
ans += v;
}
cout<<ans<<endl;
}
int main() {
#ifndef INTERACTIVE
ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#endif
int t = 1;
#ifdef TESTCASES
cin>>t;
#endif
for (int i = t; i--;) {
#if defined(TESTCASES) && defined(SPOJ_BULLSCHEI__SZ__E__KIJETESANPAKALU__)
cout<<"Case "<<t-i<<":\n";
#elif defined(SPOJ_BULLSCHEI__SZ__E__KIJETESANPAKALU__)
#warning SPOJ_BULLSCHEIßE__KIJETESANPAKALU__ without TESTCASES doesn't ducking make sense!
#endif
solve();
}
return 0;
}
