#include <iostream>
#include <cstdlib>

typedef long long ll;

using namespace std;

int n, d[1000001];

int main () {
	
	cin >> n;
	
	if (n == 1) {
		cout << 0;
		return 0;
	}
	
	for (int i = 0; i < n - 1; i++) {
		int a, b;
		cin >> a >> b;
		d[a]++;
		d[b]++;
	}
	
	int k = -2;
	
	for (int i = 1; i <= n; i++) {
		if (d[i] == 1) k++;
	}
	
	cout << k;
}