#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=double;
#define FOR(i,a,b) for(ll i=a;i<(ll)b;++i)
#define F(n) FOR(i,0,n)
#define FF(n) FOR(j,0,n)
#define aa first
#define bb second
#define PB push_back
#define EQ(a,b) (fabs(a-b)<=(fabs(a+b)*EPS))
#define MOD ((ll)(1e9+7))
#define INF (1ll << 40)
vector<vector<ll>> g;

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  ll n;
  cin >> n;
  g = vector<vector<ll>>(n);
  F(n-1){
    ll x,y;
    cin >> x >> y;
    x --; y --;
    g[x].PB(y);
    g[y].PB(x);
  }
  ll res = 0;
  F(n) if (g[i].size() > 2) res += g[i].size() - 2;
  cout << res << endl;
  

  return 0;
}