#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <functional>

using namespace std;
typedef long long int ll;

#define repi(i,a,b) for(ll i=a;i<b;i++)
#define rep(i,a) repi(i,0,a)
#define rrep(i,a) for(ll i=a-1;i>=0;i--)

int main(){
  ll N;
  cin >> N;
  vector<vector<ll> > edges(N);
  rep(i, N-1){
    ll a, b;
    cin >> a >> b;
    edges[a-1].push_back(b-1);
    edges[b-1].push_back(a-1);
  }

  ll ans = 0;
  for(auto it = edges.begin(); it != edges.end(); ++it){
    if((*it).size() >= 2) ans += (*it).size() - 2;
  }
  cout << ans << endl;
  return 0;
}