#include <vector>
#include <iostream>
#include <utility>
#include <algorithm>
using namespace std;

vector<vector<int>> Graph;
vector<bool> checked;
vector<vector<int>> vec;

int dfs(int i,int parent){
  checked[i]=true;
  for(int to:Graph[i]){
    if(!checked[to]){
      int p=dfs(to,i);
      vec[i].push_back(p);
    }
  }
  int res=1;
  sort(vec[i].rbegin(),vec[i].rend());
  if(vec[i].size()<=2){
    for(int j:vec[i]){
      res+=j;
    }
  }else{
    for(int j=0;j<2;j++){
      res+=vec[i][j];
    }
    if(parent!=-1){
      for(int j=2;j<vec[i].size();j++){
        vec[parent].push_back(vec[i][j]);
      }
    }
  }
  return res;
}

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