#include <bits/stdc++.h>
using namespace std;
#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for (int i=(a);i>=(b);--i)
using ll=long long;
using ii=pair<int,int>;
using pll=pair<ll,ll>;
const int mxN = 1e5+5;
const int mxM = mxN;
const int mxK = 1e5+5;
int N, M, K;
vector<int> al[mxN];
ii fruit[mxN];
vector<int> vals;
ll dp[mxN][1005];
void dfs(int u) {
for (int v : al[u]) {
dfs(v);
}
FOR(k,0,SZ(vals)-1){
dp[u][k] = 0;
for (int v : al[u]) dp[u][k] += dp[v][k];
if (fruit[u].first <= k) {
ll sum = fruit[u].second;
for (int v : al[u]) sum += dp[v][fruit[u].first];
dp[u][k] = max(dp[u][k],sum);
}
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
cin >> N >> M >> K;
FOR(i,2,N){
int P; cin >> P;
al[P].push_back(i);
}
FOR(i,1,N) fruit[i] = ii(-1,-1);
FOR(i,1,M){
int V, D, W; cin >> V >> D >> W;
fruit[V] = ii(D,W);
vals.push_back(D);
}
vals.push_back(mxK);
sort(ALL(vals)); vals.resize(unique(ALL(vals))-vals.begin());
fruit[0] = ii(mxK,0);
FOR(i,0,N) if (fruit[i] != ii(-1,-1)) {
fruit[i].first = lower_bound(ALL(vals),fruit[i].first)-vals.begin();
}
dfs(1);
cout << dp[1][SZ(vals)-1] << '\n';
}
