#include <iostream>
#include <vector>
#define rep(i,a,b) for(i=a;i<b;i++)
using namespace std;
using Graph = vector<vector<int>>;
  vector<int> a[100001];
  vector<bool> tomato;
void f(int v,int p){
  bool topi=false;
  for(auto ch:a[v]){
    if(ch==p)continue;
    f(ch,v);
    if(tomato[ch])topi=true;
  }
  if(!topi)tomato[v]=true;
}

int main() {
  int n,aa,b,i;
  cin>>n;

  rep(i,0,n-1){
    cin>>aa>>b;
    a[aa].push_back(b);
    a[b].push_back(aa);
  }
  tomato.assign(n,false);
  f(1,0);
  int h=0;
  rep(i,0,n+1){
    if(tomato[i])h++;
  }
  cout<<h<<endl;
}