#include <iostream>
#include <vector>
#include <atcoder/dsu>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int N;
vector<vector<int>> E;
vector<int> P;
vector<int> I;

vector<int> dp[2];

int main(){
  cin >> N;
  E.resize(N);
  rep(i,N-1){
    int u,v; cin >> u >> v; u--; v--;
    E[u].push_back(v);
    E[v].push_back(u);
  }
  P.assign(N,-1);
  I = {0};
  rep(i,I.size()){
    int p = I[i];
    for(int e : E[p]) if(P[p] != e){
      P[e] = p;
      I.push_back(e);
    }
  }

  rep(t,2) dp[t].assign(N,t);

  for(int i=N-1; i>=0; i--){
    int p = I[i];
    for(int e : E[p]) if(P[p] != e){
      dp[0][p] += dp[1][e];
      dp[1][p] += min(dp[1][e],dp[0][e]);
    }
  }

  int ans = min(dp[0][0],dp[1][0]);
  cout << ans << endl;
  return 0;
}

struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_inst;