#include <iostream>

using namespace std;

int main()
{
    int n;
    cin >> n;
    int start, t[n];
    bool level[n];
    for(int i=0; i<n; i++){
        t[i] = -1;
        level[i] = 1;
    }
    int x, y;
    for(int i=0; i<n-1; i++){
        cin >> x >> y;
        t[y-1] = x-1;
        level[x-1] = 0;
    }
    for(int i=0; i<n; i++){
        if(t[i] == -1){
            start = i;
        }
    }
    int h, dist=0, Max=0, meg;
    for(int i=0; i<n; i++){
        if(level[i] == 1){
        h=i;
        dist=0;
            while(h != start){
                h = t[h];
                dist++;
            }
            if(dist > Max){
                Max = dist;
                meg = i+1;
            }
        }
    }
    cout << meg;
}