#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0, i##_len=(n); i<i##_len; ++i)
#define REP(i,num,n) for(ll i=num, i##_len=(n); i<i##_len; ++i)
#define all(x) (x).begin(),(x).end()
#define sz(x) ((ll)(x).size())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define MEMSET(v, h) memset((v), h, sizeof(v))
#define pb push_back
#define mp make_pair
#define y0 y3487465
#define y1 y8687969
#define j0 j1347829
#define j1 j234892
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
using namespace std;

int main(){
  ll N;
  cin >> N;

  vector<ll> nums(N+1, 0);
  rep(i,N-1){
    ll a, b;
    cin >> a >> b;
    ++nums[a];
    ++nums[b];
  }
  
  ll ans = 0;
  REP(i,1,N+1){
    ll sub = nums[i] - 2;
    if(sub > 0){
      ans += sub;
    }
  }
  
  cout << ans << endl;



  return 0;
}