#include "race.h"
#include<bits/stdc++.h>
using namespace std;
vector<int>vs;
vector<int>vs1;
vector<vector<pair<int,int>>>adj;
int ans=1e9;
int pog=0;
void dfs(int node,int lol,int sum)
{
vs[node]=true;
if(sum>pog)
return;
if(sum==pog)
{
ans=min(ans,lol);
return;
}
for(auto i:adj[node])
{
if(!vs[i.first]){
// cout<<node<<" "<<i.first<<" "<<i.second<<endl;
dfs(i.first,lol+1,sum+i.second);
}
}
}
int best_path(int n, int k, int h[][2], int l[])
{
pog=k;
adj.resize(n+1);
vs.resize(n+1);
vs1=vs;
for(int i=0;i<n-1;i++)
{
// cout<<h[i][0]<<" "<<h[i][1]<<" "<<l[i]<<endl;
adj[h[i][0]].push_back({h[i][1],l[i]});
adj[h[i][1]].push_back({h[i][0],l[i]});
}
for(int i=0;i<n;i++)
{
vs=vs1;
dfs(i,0,0);
//cout<<ans<<endl;
}
if(ans==1e9)ans=-1;
return ans;
}
