#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pi = pair<int, int>;
using pl = pair<long long, long long>;
using vi = vector<int>;
using vl = vector<long long>;
using vpi = vector<pair<int, int>>;
using vpl = vector<pair<long long, long long>>;
#define fur(i, a, b) for(ll i = a; i <= (ll)b; ++i)
#define ruf(i, a, b) for(ll i = a; i >= (ll)b; --i)
#define fr first
#define sc second
#define mp make_pair
#define pb emplace_back
#define nl "\n"
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
const ll mxN = 1e3 + 1;
const ll inf = 1e18L;
#warning constants are according to subtask
vpl adj[mxN];
ll ans[mxN];
ll dfs(ll cur, ll src) {
// cerr << cur << ' ';
ll mx = inf;
ll sm = inf;
for(auto [ch, wt] : adj[cur]) {
if(ch != src) {
ll opt = dfs(ch, cur) + wt;
if(opt < mx) {
sm = mx;
mx = opt;
} else if(opt < sm) {
sm = opt;
}
}
}
return (sm == inf ? 0 : sm);
}
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
fur(i, 0, M - 1) {
ll a = R[i][0], b = R[i][1], wt = L[i];
adj[a].pb(b, wt);
adj[b].pb(a, wt);
// cout << a << ' ' << b << ' ' << wt << nl;
}
// fur(i, 0, N - 1) {
// cout << i << " : ";
// for(auto [j, w] : adj[i]) {
// cout << j << ',' << w << ' ';
// }
// cout << nl;
// }
return dfs(0, -1);
}
