/*
TASK: tri
LANG: c++
*/
#include<iostream>
using namespace std;
bool fr[501][501];
long int br=0;
int main()
{
 int n,a,b;
 cin>>n;
 while(a!=0 && b!=0)
  {
   bool key=0;
   cin>>a>>b;
   if(fr[a][b]) key=1;
   fr[a][b]=fr[b][a]=1;
   if(!key) 
    for(int c=1;c<=n;c++) 
     if(fr[a][c] && fr[b][c]) br++;          
  }
 cout<<br<<endl; 
 return 0;    
}
