#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n)for (int i = 0; i < int(n); ++i)
#define rrep(i,n)for (int i = int(n)-1; i >= 0; --i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
template<class T> void chmax(T& a, const T& b) {a = max(a, b);}
template<class T> void chmin(T& a, const T& b) {a = min(a, b);}
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    dsu d(2 * n);
    rep(i, n - 1) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        d.merge(u, n + v);
        d.merge(v, u + n);
    }
    int cnt = 0;
    auto gs = d.groups();
    for(int i: gs[0]) cnt += i < n;
    int ans = min(cnt, n - cnt);
    cout << ans << endl;
}