#include<bits/stdc++.h>
using namespace std;
#include<atcoder/all>
using namespace atcoder;
using mint=modint1000000007;
using ll=long long;
#define rep(i,N) for(int i=0;i<N;++i)
ll N,a,b;
int main(){
  cin>>N;
  dsu g(N*2);
  rep(i,N-1){
    cin>>a>>b;
    --a;--b;
    g.merge(a,b+N);
    g.merge(b,a+N);
  }
  a=0;
  rep(i,N)a+=g.same(0,i);
  cout<<min(a,N-a)<<endl;
}