#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5;
int sgt[4*N];
vector<int>dp(N);
void build(int i, int l, int r){
if(l==r){
sgt[i]=dp[l];
return;
}int mid=(l+r)/2;
build(2*i, l, mid);
build(2*i+1, mid+1, r);
sgt[i]=max(sgt[2*i], sgt[2*i+1]);
return;
}void updt(int i, int l, int r, int idx, int val){
if(l<=idx && idx<=r){
if(l==r && idx==l){
sgt[i]=val;
return;
}int mid=(l+r)/2;
updt(2*i, l, mid, idx,val);
updt(2*i+1, mid+1, r, idx, val);
sgt[i]=max(sgt[2*i], sgt[2*i+1]);
return;
}return;
}int find(int i,int l,int r, int tl, int tr){
if(tl<=l && r<=tr){
return sgt[i];
}else if(tr<l || tl>r){
return 0;
}int mid=(l+r)/2;
int a=find(2*i, l, mid, tl, tr);
int b=find(2*i+1, mid+1, r, tl, tr);
return max(a,b);
}
int32_t main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, m,k;
cin>>n>>m>>k;
vector<int>p(n+2),deg(n+2);
for(int i=2; i<=n; i++){
cin>>p[i];
deg[p[i]]++;
}int sum=0;
bool check=true;
vector<int>day(n+4);
for(int i=0; i<m; i++){
int v,d,w;
cin>>v>>d>>w;
day[v]=d;
if(deg[v]!=0)check=false;
sum+=w;
}if(check)cout<<sum<<endl;
else {
build(1, 1, k);
for(int i=n; i>=1; i--){
if(day[i]!=0){
dp[day[i]]=find(1, 1, k, 1, day[i])+1;
updt(1, 1, k, day[i], dp[day[i]]);
//cout<<day[i]<<" "<<dp[day[i]]<<endl;
}
}int mx=0;
for(int i=1; i<=k; i++){
mx=max(mx,dp[i]);
}cout<<mx<<endl;
}
return 0;
}
