#include <bits/stdc++.h>
#define ft first
#define sc second
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) {if(a<b) a=b;}
#define chmin(a, b) {if(a>b) a=b;}
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
typedef map<ll, ll> Map;
static const ll INF=1e18;
static const ll MAX=1e5+7;
static const ll MOD=1e9+7;
ll max(ll a, ll b) {return a>b ? a:b;}
ll min(ll a, ll b) {return a<b ? a:b;}

ll N;
vector<ll> g[MAX];

int main() {
    cin >> N;
    ll i;
    
    for(i=0; i<N-1; i++) {
        ll a, b;
        cin >> a >> b;
        a--; b--;
        g[a].pb(b);
        g[b].pb(a);
    }
    
    ll ans=0;
    for(i=0; i<N; i++)
        ans+=max(0, g[i].size()-2);
    
    pt(ans);
    
}