#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define lsb(x) (x&(-x))
#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();}
int n,m;
vector<vector<pii>>adjlist;
bool isring=true;
int maxxy=0;
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W)
{
int n=N,m=M;
adjlist.resize(n);
for(int a=0;a<n;a++)
{
maxxy=max(maxxy,W[a]);
adjlist[U[a]].pb(mp(V[a],W[a]));
adjlist[V[a]].pb(mp(U[a],W[a]));
}
for(int i=0;i<n;i++)
{
if(adjlist[i].size()==1)isring=false;
}
}
int getMinimumFuelCapacity(int X, int Y)
{
if(isring)return maxxy;
else return -1;
}
