#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

//template
#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define ALL(v) (v).begin(),(v).end()
using ll=long long int;
const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; const double eps=1e-12;
template<typename T>inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<typename T>inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}

vector<int> g[101010];
int dp[101010][2];
void dfs(int v,int p){
   for(auto& to:g[v])if(to!=p){
      dfs(to,v);
      dp[v][0]+=dp[to][1];
      dp[v][1]+=min(dp[to][0],dp[to][1]);
   }
   dp[v][1]++;
}

int main(){
   int n;
   cin>>n;
   rep(_,0,n-1){
      int x,y;
      cin>>x>>y;
      x--; y--;
      g[x].push_back(y);
      g[y].push_back(x);
   }

   dfs(0,-1);
   cout<<min(dp[0][0],dp[0][1])<<'\n';
   return 0;
}