#include <bits/stdc++.h>
using namespace std;
using lli = int_fast64_t;
using ulli = uint_fast64_t;
#define debug(x) cerr << #x << " : " << x << endl
#define debugv(x) cerr << #x << " : {";for(auto value_of_x:x){ cerr << value_of_x << ", ";}cerr << endl


namespace atcoder {
	template<typename T>
	T ncr(T left, T right) {
		right = min(left - right, right);
		T ans = 1;
		for (T i = 1; i <= right; i++) {
			ans = ans * (left - right + i) / i;
		}
		return ans;
	}

	const lli MOD = 1000000007;
	const lli LIMIT = 1'0'000'000'000'000'000 * 5;
	const int tenfive = 100000;
}

using namespace atcoder;

int main() {
	int N;
	cin >> N;
	vector<int> c(N+1);
	c[0] = 2;
	for (int i = 0; i < N-1; i++) {
		int a, b;
		cin >> a >> b;
		c[a]++;
		c[b]++;
	}
	int cou = count(c.begin(), c.end(), 1);
	cout << cou - 2 << endl;
	return 0;
}