#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);

    int n;
    cin >> n;
        vector<vector<int> > graf(n);
    for(int i=1;i<n;i++) {
        int a,b;
        cin >> a >> b;
        graf[a-1].push_back(b-1);
        graf[b-1].push_back(a-1);
    }
    if(n == 1) {
        cout<<0<<endl;
        return 0;
    }
    int ct = 0;
    for(auto a:graf)
        if(a.size() == 1)
            ct++;
    cout<<ct-2<<endl;
}