// Gyak_Tuzijatek.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
int main()
{
int n;
cin >> n;
vector<vector<int>> graph(n+1);
vector<int> away(n+1, -1);
for (size_t i = 0; i < n-1; i++)
{
int a, f;
cin >> a >> f;
graph[a].push_back(f);
away[f] = 0;
}
int parent = -1;
for (size_t i = 1; i < away.size(); i++)
{
if (away[i] == -1) {
parent = i;
break;
}
}
queue<pair<int,int>> BFS;
BFS.push({ parent,0 });
while (!BFS.empty()) {
pair<int, int> p = BFS.front();
for (size_t i = 0; i < graph[p.first].size(); i++)
{
BFS.push({ graph[p.first][i],p.second+1 });
}
if (BFS.size() == 1 && graph[p.first].size() == 0) {
cout << p.first;
return 0;
}
BFS.pop();
}
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file