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>
#define f first
#define s second
#define vec vector
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define pw(x) (1LL<<(x))
#define sz(x) (int)(x).size()
#define fast_iati ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
template<class T> bool umin(T &a,const T &b){return (a>b?a=b,1:0);}
template<class T> bool umax(T &a,const T &b){return (a<b?a=b,1:0);}
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll>pll;
const int N=201;
const int K=2001;
const ll inf=1e16;
int b[N][K],s[N][K];
ll dst[N][N];
ll mx[N][N];
signed main(){
fast_iati;
int n,m,k;
cin>>n>>m>>k;
for(int i=0;i<n;i++){
for(int j=0;j<k;j++){
cin>>b[i][j]>>s[i][j];
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(i==j) continue;
for(int t=0;t<k;t++){
if(b[i][t]==-1 || s[j][t]==-1) continue;
umax(mx[i][j],(ll)-b[i][t]+s[j][t]);
}
}
}
for(int i=0;i<n;i++){
for(int j=0;j<n;j++) dst[i][j]=inf;
dst[i][i]=0;
}
for(int i=0;i<m;i++){
int v,u,w;
cin>>v>>u>>w;--v;--u;
umin(dst[v][u],(ll)w);
}
for(int t=0;t<n;t++){
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
umin(dst[i][j],dst[i][t]+dst[t][j]);
}
}
}
auto check=[&](ll x){
vec<vec<ll>>f(n,vec<ll>(n,-inf));
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
if(dst[i][j]<=inf/x && i!=j){
umax(f[i][j],mx[i][j]-1ll*x*dst[i][j]);
}
}
}
for(int k=0;k<n;k++){
for(int i=0;i<n;i++){
for(int j=0;j<n;j++){
umax(f[i][j],min(inf,f[i][k]+f[k][j]));
}
}
}
for(int i=0;i<n;i++){
if(f[i][i]>=0)
return 1;
}
// int ok=(f[0][0]>=0);
return 0;
};
// cout<<check(3);
// return 0;
ll l=1,r=inf;
while(l!=r){
ll mid=(l+r)/2;
if(check(mid)) l=mid+1;
else r=mid;
}
cout<<l-1;
return 0;
}
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