#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<unordered_set>
using namespace std;

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

    int ans = -2;
    for(int i=0;i<N;i++) if(G[i].size() == 1) ans++;
    cout << ans << endl;
}