#include <iostream>
#include <vector>
#include <map>

using namespace std;
using LL = long long;
using ULL = unsigned long long;

int main() {
    int N;
    cin >> N;

    vector<int> G[N + 1];
    int a, b;
    for (int i = 0; i < N - 1; i++) {
        cin >> a >> b;
        G[a].push_back(b);
        G[b].push_back(a);
    }

    map<int, int> D;
    for (int i = 1; i <= N; i++) {
        D[G[i].size()]++;
    }

    cout << D[1] - 2 << endl;
}