#include <iostream>
#include <string>
#include <algorithm>
#include <utility>
#include <cmath>
#include <cstdlib>
#include <map>
#include <set>
#include <queue>
#include <vector>
using namespace std;
using Graph = vector<vector<int>>;

vector<int> depth;
vector<int> subtree_size;
vector<int> dp; //vが黒、白の個数
vector<int> dp2; //vが白、白の個数
void dfs(const Graph& G, int v, int p, int d) {
    depth[v] = d;
    for (auto nv : G[v]) {
        if (nv == p) continue;
        dfs(G, nv, v, d + 1);
    }

    subtree_size[v] = 1;
    dp[v] = 0;
    dp2[v] = 1;
    for (auto c : G[v]) {
        if (c == p) continue;
        subtree_size[v] += subtree_size[c];
        dp[v] += max(dp[c], dp2[c]);
        dp2[v] += dp[c];
    }
}

int main() {
    int N; cin >> N;

    Graph G(N);
    for (int i = 0; i < N - 1; i++) {
        int a, b;
        cin >> a >> b;
        G[a - 1].push_back(b - 1);
        G[b - 1].push_back(a - 1);
    }

    depth.assign(N, 0);
    subtree_size.assign(N, 0);
    dp.assign(N, 0);
    dp2.assign(N, 0);
    dfs(G, 0, -1, 0);

    cout << N - max(dp[0], dp2[0]) << endl;
}