#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define ll long long
#define sz(x) x.size()
const int INF = (int)(1e18);
vector<pair<int,int> > vec[100005];
ll dp[100005];
void dfs(int node,int p){
dp[node]=INF;
multiset<ll> myset;
for(auto it:vec[node])
if(it.fi!=p)
dfs(it.fi,node),myset.insert(dp[it.fi]+it.se);
if(!sz(myset))dp[node]=0;
else if(sz(myset)>=2)dp[node]=*next(myset.begin());
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
for (int i = 0; i < M; ++i)
{
vec[R[i][0]].pb({R[i][1],L[i]});
vec[R[i][1]].pb({R[i][0],L[i]});
}
dfs(0,0);
return dp[0];
}
