#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

#define reps(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n)   reps(i,0,n)
#define all(x) (x).begin(),(x).end()
#define INF (1000000000)
#define MOD (1000000007)
#define PI (acos(-1))

int main(){
  int n;
  cin >> n;
  vector<int> v[n];
  rep(i,n-1){
    int a,b;
    cin >> a >> b;
    a--;b--;
    v[a].push_back(b);
    v[b].push_back(a);
  }
  int cnt=0;
  rep(i,n){
    if(v[i].size() >= 3){
      cnt += v[i].size()-2;
    }
  }
  cout << cnt << endl;
}