#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
const int N = 3e4 + 50, M = N << 1;
int adj[N], nxt[M], to[M], ecnt;
inline void addEdge(int f, int t)
{
    ecnt++;
    nxt[ecnt] = adj[f];
    adj[f] = ecnt;
    to[ecnt] = t;
}
int main()
{
    int n;
    scanf("%d", &n);
    for (int i = 1, u, v; i < n; i++)
        scanf("%d%d", &u, &v), addEdge(u, v), addEdge(v, u);
    return 0;
}