#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef pair<int,pii> ipii;
#define pb push_back
#define fi first
#define se second
#define sz(x) (int)(x).size()
#define rdint(x,y) rnd()%(y-x+1)+x
#define debug(x) cerr<<#x<<" is "<<x<<endl;
#define debugp(x,y) cerr<<#x<<' '<<#y<<" is "<<x<<' '<<y<<endl;
#define debugl(x) cerr<<#x<<" is ";for(auto p:x)cerr<<p<<" ";cerr<<endl;
#define debugpl(x) cerr<<#x<<" is ";for(auto p:x)cerr<<p.first<<" "<<p.second<<" , ";cerr<<endl;
#include <vector>
int ans=0;
void init(int N, int M, std::vector<int> U, std::vector<int> V, std::vector<int> W) {
if(N==M)ans=*max_element(W.begin(),W.end());
else ans=-1;
}
int getMinimumFuelCapacity(int X, int Y) {
return ans;
}
