#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
#define ss second
#define ff first
#define piii pair<int,pii>
#define debu(x) (cerr << #x << " = "<< x << "\n")
#define debu2(x,y) (cerr << #x << " = "<< x << " " << #y << " = " << y << "\n")
#define debu3(x,y,z) (cerr << #x << " = "<< x << " " << #y << " = " << y << " " << #z << " = " << z<< "\n")
#define bitout(x,y) {\
cerr << #x << " : ";\
for (int justforbits = y; justforbits >=0; justforbits--)cout << (((1 << justforbits) & x)>=1);\
cout << "\n";\
}
#define rangeout(j,rangestart,rangeend) {\
cerr << "outputting" << #j<< ":\n";\
for (int forrang = rangestart; forrang <= rangeend; forrang++)cerr << j[forrang] << " ";\
cerr<<"\n";\
}
#define c1 {cerr << "Checkpoint 1! \n\n";cerr.flush();}
#define c2 {cerr << "Checkpoint 2! \n\n";cerr.flush();}
#define c3 {cerr << "Checkpoint 3! \n\n";cerr.flush();}
#define c4 {cerr << "Checkpoint 4! \n\n";cerr.flush();}
signed main()
{
int t1,t2,t3,t4;
mt19937_64 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
//ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n,m,k;cin>>n>>m>>k;
vector<int>myliz;
for(int a=1;a<n;a++){cin>>t1;}
vector<bool>iexist(n+1,false);
vector<int>nummys(n+1);
vector<int>thelist;
for(int a=1;a<=m;a++)
{
cin>>t1>>t2>>t3;
iexist[t1]=true;
nummys[t1]=t2;
}
//increasing sequence
for(int a=n;a>=2;a--)
{
int curr=nummys[a];
if(myliz.empty()||myliz[myliz.size()-1]<=curr)
{
myliz.pb(curr);
}
else
{
myliz[upper_bound(myliz.begin(),myliz.end(),curr)-myliz.begin()]=curr;
}
}
cout<<myliz.size();
}
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