#include <bits/stdc++.h>

#define fst(t) std::get<0>(t)
#define snd(t) std::get<1>(t)
#define thd(t) std::get<2>(t)
#define unless(p) if(!(p))
#define until(p) while(!(p))

using ll = std::int64_t;
using P = std::tuple<int,int>;

int N;
std::vector<int> G[100100];

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

    std::cin >> N;

    for(int i=1;i<N;++i){
        int a, b;
        std::cin >> a >> b;

        G[a].emplace_back(b);
        G[b].emplace_back(a);
    }

    int cnt = 0;

    for(int i=1;i<=N;++i){
        cnt += std::max((int)G[i].size() - 2, 0);
    }

    std::cout << cnt << std::endl;
}