#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;


int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int n;
    cin>>n;
    vector<vector<int>> g(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);
    }
    vector<int> dp1(n,0),dp2(n,0);
    auto calc = [&](auto calc,int ni,int p) -> void {
        for(auto&to:g[ni]) if(to!=p) {
            calc(calc,to,ni);
            dp1[ni] += dp2[to];
            dp2[ni] += min(dp1[to],dp2[to]);
        }
        dp2[ni]++;
    };
    calc(calc,0,-1);
    int ans = min(dp1[0],dp2[0]);
    cout<<ans<<endl;
}