#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000000


int main(){
	
	int N;
	cin>>N;
	
	vector<int> t(N,0);
	
	rep(i,N-1){
		int a,b;
		cin>>a>>b;
		a--;b--;
		t[a]++;
		t[b]++;
	}
	
	int ans = -2;

	rep(i,N){
		if(t[i]==1)ans++;
	}
	
	cout<<ans<<endl;
	
    return 0;
}