#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
#define eb emplace_back
vector<int> adj[520];
int tour[520],node[520],id;
void dfs(int u){
tour[u] = ++id;
node[id] = u;
for(auto &v:adj[u]) if(!tour[v]) dfs(v);
}
bool ask(int m){
vector<int> v;
for(int i=1;i<=m;++i) v.eb(node[i]);
return query(v);
}
int findEgg(int N, vector<pair<int,int>> bridges){
for(int i=1;i<=N;i++) adj[i].clear();
for(auto &[u,v]:bridges) adj[u].eb(v), adj[v].eb(u);
id = 0;
dfs(1);
int l=1,r=N;
while(l<r){
int m = (l+r)>>1;
if(ask(m)) r = m;
else l = m+1;
}
return node[l];
}
