#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

vector<int> g[100000];
bool used[100000];
int dp[100000][2]; // 0: 白、1: 黒

void dfs(int v){
    used[v] = true;
    dp[v][0] = 0;
    dp[v][1] = 1;
    for(int to: g[v]){
        if(!used[to]) {
            dfs(to);
            dp[v][0] += dp[to][1];
            dp[v][1] += min(dp[to][0], dp[to][1]);
        }
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n; cin >> n;
    for(int i = 0; i < n-1; i++){
        int u, v; cin >> u >> v; u--; v--;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    dfs(0);
    cout << min(dp[0][0], dp[0][1]) << endl;
}