#include <bits/stdc++.h>
using namespace std;
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define int long long
vector<vector<int>> child;
vector<int> w,d;
vector<int> hu;
vector<int> mu;
map<int,int> dp(int x){
vector<map<int,int>> v;
for (auto u : child[x])
{
v.push_back(dp(u));
}
sort(all(v), [](map<int,int> a, map<int,int> b){return sz(a)>sz(b);});
for (int i = 1; i < sz(v); i++)
{
if(sz(v[i])==0) continue;
for (auto u : v[i])
{
v[0][u.first]+=u.second;
}
}
if(sz(v)>0){
auto it=v[0].upper_bound(d[x]);
if(it!=v[0].end()) {
v[0][(*it).first]-=w[x];
}
v[0][d[x]]+=w[x];
}else{
v.resize(1);
v[0][d[x]]=w[x];
}
return v[0];
}
signed main() {
ios_base::sync_with_stdio(false); cin.tie(nullptr);
int n,m,k; cin >> n >> m >> k;
child.resize(n);
w.resize(n,0);
d.resize(n,0);
hu.resize(k,false);
mu.resize(k,false);
for (int i = 1; i < n; i++)
{
int p; cin >> p;
child[p-1].push_back(i);
}
for (int i = 0; i < n; i++) {
int v; cin >> v;
cin >> d[v-1] >> w[v-1];
}
map<int,int> mp=dp(0);
int mx=0;
for (auto u : mp) mx+=u.second;
cout << mx << "\n";
return 0;
}
