#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> lpair;
const ll MOD = 1e9 + 7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i = (m); i < (n); i++)
#define rrep(i,m,n) for(ll i = (m); i >= (n); i--)
#define print(x) cout << (x) << endl;
#define print2(x,y) cout << (x) << " " << (y) << endl;
#define printa(x,n) for(ll i = 0; i < n; i++){ cout << (x[i]) << " ";} cout<<endl;
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N;
    ll A[100010], B[100010];
    cin >> N;
    ll cnt[100010] = {};
    rep(i,0,N-1){
        cin >> A[i] >> B[i];
        A[i]--; B[i]--;
        cnt[A[i]]++; cnt[B[i]]++;
    }
    ll ans = 0;
    rep(i,0,N){
        if(cnt[i] >= 3){
            ans += cnt[i]-2;
        }
    }
    print(ans);
    
}