#include <bits/stdc++.h>
typedef long long ll;
#define FOR(i,a,b) for(ll i=(a);i<(b);i++)
#define REP(i,a) FOR(i,0,a)
using namespace std;
ll N;
const ll MAX_N=1e5;
vector<ll> G[MAX_N];
ll dst[MAX_N];
void dfs(ll v,ll p,ll d){
	dst[v]=d;
	for(auto e:G[v]){
		if(e!=p){
			dfs(e,v,d+1);
		}
	}
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin>>N;
	REP(i,N-1){
		ll a,b;
		cin>>a>>b;
		a--;
		b--;
		G[a].push_back(b);
		G[b].push_back(a);
	}
	ll ans=0;
	REP(i,N){
		ans+=max((ll)G[i].size()-2,0ll);
	}
	cout<<ans<<endl;
}