#include <bits/stdc++.h>

/* strict input checker */

int read_int() {
	int c = getchar(), s = 0, res = 0;
	if (c == '-') s = 1, c = getchar();
	assert('0' <= c && c <= '9');
	if (s) assert(c != '0');
	res = c - '0';
	while (1) {
		c = getchar();
		if (c < '0' || c > '9') break;
		assert(res <= 200000000); // avoid overflow
		assert(res); // no leading-zero
		res = res * 10 + c - '0';
	}
	ungetc(c, stdin);
	return s ? -res : res;
}
void read_linebreak() {
	int c = getchar();
	if (c == '\r') c = getchar();
	assert(c == '\n');
}

struct UnionFind {
	std::vector<int> data;
	UnionFind (int size) : data(size, -1) {}
	bool unite(int x, int y) {
		x = root(x);
		y = root(y);
		if (x != y) {
			if (data[y] < data[x]) std::swap(x, y);
			data[x] += data[y];
			data[y] = x;
		}
		return x != y;
	}
	bool same(int x, int y) { return root(x) == root(y); }
	int root(int x) { return data[x] < 0 ? x : data[x] = root(data[x]); }
	int size(int x) { return -data[root(x)]; }
	bool connected() { return size(0) == (int) data.size(); }
};

int main() {
	int n = read_int();
	read_linebreak();
	
	assert(2 <= n && n <= 100000);
	
	UnionFind uni(n);
	for (int i = 1; i < n; i++) {
		int a = read_int();
		assert(getchar() == ' ');
		int b = read_int();
		read_linebreak();
		
		assert(1 <= a && a <= n);
		assert(1 <= b && b <= n);
		assert(uni.unite(a - 1, b - 1));
	}
	assert(getchar() == EOF);
	return 0;
}