/*
TASK:tri
LANG:C++
*/
#include<iostream>
using namespace std;
int a[512][512],n,m,p,i,j,k1=1,k2=1,b[512],c[512],d;
int main()
{
    cin>>n;
    while(k1||k2)
    {
                 cin>>k1>>k2;
                 b[d]=k1;
                 c[d]=k2;
                 a[k1][k2]=a[k2][k1]=1;
                 d++;
    }
    for(i=0;i<d;i++)
    {
                    for(j=1;j<=n;j++)
                    {
                                    if(a[c[i]][j]&&a[b[i]][j]&&b[i]!=j)p++;
                    }
    }
    cout<<p/3<<"\n";
    return 0;
}
