//Trumling ©
//Αφόδευε υψηλά και ηγνάντει
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define pb push_back
#define F first
#define S second
#define enter cout<<'\n';
#define INF 99999999999999999
#define MOD 1000000007
#define all(x) x.begin(),x.end()
vector<vector<ll>>g;
vector<vector<ll>>g2;
vector<pair<ll,ll>>f;
vector<pair<ll,ll>>f2;
vector<vector<ll>>d;
ll k;
ll id=1;
void dfs1(int start,int pre,int prev)
{
if(f[start].F!=0)
{
g2[id].pb(prev);
g2[prev].pb(id);
f2[id]=f[start];
prev=id++;
}
for(auto x:g[start])
if(x!=pre)
dfs1(x,start,prev);
}
void dfs(int start,int pre)
{
d[start][f2[start].F]=f2[start].S;
for(auto x:g2[start])
if(x!=pre)
{
dfs(x,start);
ll maxi=0;
for(int i=1;i<=k;i++)
{
maxi=max(maxi,d[x][i]);
d[start][i]+=maxi;
}
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n,m;
cin>>n>>m>>k;
g.assign(n+1,vector<ll>());
f.assign(n+1,{0,0});
for(int i=2;i<=n;i++)
{
ll x;
cin>>x;
g[i].pb(x);
g[x].pb(i);
}
for(int i=0;i<m;i++)
{
ll x,y,z;
cin>>x>>y>>z;
f[x]={y,z};
}
d.assign(m+1,vector<ll>(k+1,0));
g2.assign(m+1,vector<ll>());
f2.assign(m+1,{0,0});
dfs1(1,1,0);
dfs(0,0);
ll ans=0;
for(int i=1;i<=k;i++)
ans=max(ans,d[0][i]);
cout<<ans;
}
