#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
vector<pair<int, int>> ad[N];
int n, m;
int p[N];
bool sub1 = 1;
int answers1 = 0;
void init(int N, int M, vector<int> U, vector<int> V, vector<int> W) {
n = N; m = M;
for (int i = 1; i <= M; ++i) {
int u = U[i - 1], v = V[i - 1], w = W[i - 1];
// cerr << u << ' ' << v << ' ' << w << '\n';
ad[u].push_back({v, w});
ad[v].push_back({u, w});
answers1 = max(answers1, w);
if (ad[u].size() > 2 || ad[v].size() > 2) sub1 = 0;
}
}
int getMinimumFuelCapacity(int X, int Y) {
if (sub1) return (m == n - 1 ? -1 : answers1);
return 0;
}
