#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(i, a, n) for (int i = (a); i < (n); i++)
#define per(i, a, n) for (int i = (n) - 1; i >= (a); i--)
#define FOR(i, n) rep(i, a, (n))

int main(void)
{
	ios_base::sync_with_stdio(false);
	int n;
	cin >> n;
	vector<vector<int>> g(n);
	rep(i,0,n-1) {
		int x, y;
		cin >> x >> y;
		x--; y--;
		g[x].push_back(y);
		g[y].push_back(x);
	}
	int res = -2;
	rep(i,0,n) {
		if (g[i].size() == 1) res++;
	}
	if (n == 1) {
		cout << 0 << endl;
	} else {
		cout << res  << endl;
	}
	return 0;
}