#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define INF 1000000000
#define MOD 998244353
#define MAX 300000

priority_queue<int>* dfs(Graph &G,int v,int p,vector<int> &sz){
  priority_queue<int>* pq = new priority_queue<int>();
  vector<priority_queue<int>*> pqs;
  for(int nv:G[v]){
    if(nv==p){
      continue;
    }
    pqs.push_back(dfs(G,nv,v,sz));
    pq->push(sz[nv]);
  }
  sz[v]=1;
  if(pq->size()==1){
    if(pqs[0]->size()>0){
      sz[v]+=pqs[0]->top();
      pqs[0]->pop();
    }
  }
  for(int i=0;i<2;i++){
    if(pq->empty()){
      break;
    }
    sz[v]+=pq->top();
    pq->pop();
  }
  int best_i=-1;
  int best_n=pq->size();
  for(int i=0;i<pqs.size();i++){
    if(pqs[i]->size()>best_n){
      best_i=i;
      best_n=pqs[i]->size();
    }
  }
  if(best_i==-1){
    for(int i=0;i<pqs.size();i++){
      while(!pqs[i]->empty()){
        pq->push(pqs[i]->top());
        pqs[i]->pop();
      }
    }
    return pq;
  }else{
    for(int i=0;i<pqs.size();i++){
      if(i==best_i){
        continue;
      }
      while(!pqs[i]->empty()){
        pqs[best_i]->push(pqs[i]->top());
        pqs[i]->pop();
      }
    }
    while(!pq->empty()){
      pqs[best_i]->push(pq->top());
      pq->pop();
    }
    return pqs[best_i];
  }
}

int main(){
  int N;
  cin>>N;
  Graph G(N);
  for(int i=0;i<N-1;i++){
    int x,y;
    cin>>x>>y;
    x--;y--;
    G[x].push_back(y);
    G[y].push_back(x);
  }
  vector<int> sz(N);
  dfs(G,0,-1,sz);
  int ans=sz[0];
  cout<<ans<<endl;
}