// legtavolabbi.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <queue>
#define ll long long
using namespace std;
struct adat {
ll lep;
bool lat = false;
vector<ll>sz;
};
vector<adat>x;
deque<ll>v;
vector<ll>y;
ll i, n, a, b, akt, maxi, p, kozos;
int main()
{
cin >> n;
x.resize(n + 1);
y.resize(n + 1);
while (cin >> a >> b)
{
x[a].sz.push_back(b);
x[b].sz.push_back(a);
++y[b];
}
for (i = 1; i <= n; ++i)
{
if (!y[i])
{
kozos = i;
break;
}
}
x[kozos].lat = true;
x[kozos].lep = 0;
v.push_back(kozos);
while (!v.empty())
{
akt = v.front();
v.pop_front();
for (auto& e : x[akt].sz)
{
if (!x[e].lat || x[akt].lep + 1 < x[e].lep)
{
v.push_back(e);
x[e].lep = x[akt].lep + 1;
x[e].lat = true;
}
}
}
for (i = 1; i <= n; ++i)
{
if (x[i].lep > maxi)
{
maxi = x[i].lep;
p = i;
}
}
cout << p;
return 0;
}
/*
8
1 4
5 7
8 6
8 5
3 1
3 2
3 8
*/
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
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// 1. Use the Solution Explorer window to add/manage files
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// 4. Use the Error List window to view errors
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// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file