// Legtávolabbi leszármazott.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <vector>
#include <queue>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    vector<vector<int>> adj(n+1);
    vector<int>dist(n + 1, -1);
    vector<int>indegree(n + 1, 0);
    for (int i = 1; i < n; i++)
    {
        int x, y;
        cin >> x >> y;
        adj[x].push_back(y);
        adj[y].push_back(x);
        indegree[y]++;
    }
    queue<int> q;
    int maxi = 0;
    int maxip = -1;
    for (int i = 1; i <= n; i++)
    {
        if (indegree[i] == 0)
        {
            q.push(i);
            maxip = i;
            maxi = 0;
            dist[i] = 0;
        }
    }
    
    while (!q.empty())
    {
        int v = q.front();
        q.pop();
        for (auto next : adj[v])
        {
            if(dist[next]==-1)
            {
                dist[next] = dist[v] + 1;
                if (dist[next] > maxi)
                {
                    maxi = dist[next];
                    maxip = next;
                }
                q.push(next);
            }
        }
    }
    cout << maxip;
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

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//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file