#include "closing.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef double dd;
typedef long double ldd;
#define tst int T;cin>>T;for(int t=1;t<=T;t++)
#define nl cout<<"\n";
#define rep(i,l,r) for (int i=l;i<r;i++)
#define per(i,r,l) for (int i=r;i>l;i--)
#define pii pair<int,int>
#define mp(a,b) make_pair(a,b)
#define pb push_back
#define all(a) a.begin(),a.end()
#define sz(a) (int)a.size()
#define vi vector<int>
#define vll vector<ll>
#define PI 3.14159265
#define fi first
#define se second
const ll MOD1=1e9+7;
const ll MOD2=998244353;
ll mod=MOD1;
ll po(ll x,ll y,ll _prime=mod) {if(y<0)return 0;y%=(_prime-1);ll res=1;while(y>0){if(y&1)res=(res*x)%_prime;x=(x*x)%_prime;y>>=1;}return (res%_prime);}
ll gcd(ll a, ll b){if(a<b) swap(a,b);if(b==0) return a;return gcd(a%b,b);}
void bfs(int src,vll &d,vector<vector<pii>>&adj){
queue<int>q;
q.push(src);
fill(all(d),-1);
d[src]=0;
while(!q.empty()){
int u=q.front();q.pop();
for(auto [v,w]:adj[u]){
if(d[v]==-1){
d[v]=d[u]+w;
q.push(v);
}
}
}
}
int max_score(int N, int X, int Y, long long K,
std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
vector<vector<pii>>adj(N);
for(int i=0;i<N-1;i++){
adj[U[i]].pb({V[i],W[i]});
adj[V[i]].pb({U[i],W[i]});
}
vll dx(N),dy(N);
bfs(X,dx,adj);
bfs(Y,dy,adj);
sort(all(dx));sort(all(dy));
int ans=0;
int j=N-1;
ll sy=0;
for(auto i:dy)sy+=i;
ll sx=0;
rep(i,0,N+1){
while(j>=0 && sx+sy>K){
sy-=dy[j];j--;
}if(sx+sy<=K)ans=max(ans,i+j+1);
if(i==N)break;
sx+=dx[i];
}return ans;
}
