#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int N;
    cin >> N;
    vector<int> graph(N);
    rep(i,0,N-1){
        int a,b;
        cin >> a >> b;
        graph[a-1]++;
        graph[b-1]++;
    }
    int cnt = 0;
    rep(i,0,N){
        if(graph[i] > 2){
            cnt += graph[i] - 2;
        }
    }
    cout << cnt << endl;
}