#include <bits/stdc++.h>
using namespace std;
vector<int>G[101010];
int main(){
  int N;
  cin>>N;
  int V=N;
  int E=N-1;
  for(int i=1;i<=E;i++){
    int A,B;
    cin>>A>>B;
    G[A].push_back(B);
    G[B].push_back(A);
  }
  int answer=0;
  for(int i=1;i<=E;i++){
    if(G[i].size()-2>=0)answer=answer+G[i].size()-2;
  }
cout<<answer;


}