This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
ll n,m,k;
cin>>n>>m>>k;
ll b[n][k],s[n][k];
for(ll i=0;i<n;i++){
for(ll j=0;j<k;j++){
cin>>b[i][j]>>s[i][j];
}
}
vector<pair<ll,ll>>adj[n];
for(ll i=0;i<m;i++){
ll u,v,t;
cin>>u>>v>>t;
u--,v--;
adj[u].pb({v,t});
}
ll dist[n][n];
for(ll i=0;i<n;i++){
for(ll j=0;j<n;j++){
dist[i][j]=1e18;
}
}
for(ll i=0;i<n;i++){
set<pair<ll,ll>>st;
st.insert({0,i});
dist[i][i]=0;
while(!st.empty()){
auto [t,x]=*st.begin();
st.erase(st.begin());
for(auto [j,d]:adj[x]){
if(t+d<dist[i][j]){
if(dist[i][j]<1e18){
st.erase({dist[i][j],j});
}
dist[i][j]=t+d;
st.insert({dist[i][j],j});
}
}
}
}
ll ans=0;
for(ll i=1;i<n;i++){//i -> 0 -> i
if(dist[0][i]==1e18||dist[i][0]==1e18){
continue;
}
ll mx=0;
for(ll j=0;j<k;j++){
if(b[0][j]>-1&&s[i][j]>-1){
mx=max(mx,s[i][j]-b[0][j]);
}
}
ans=max(ans,mx/(dist[i][0]+dist[0][i]));
}
cout<<ans;
}
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