/*
TASK:TRI
LANG:C++
*/
#include<iostream>
int n,m[500][501],i,j,a,b,br=0,k;
using namespace std;
int main()
{
    cin>>n;
    cin>>a>>b;
    while(a&&b){
        if(a<b)m[a][b]=1;
        else m[b][a]=1;
        cin>>a>>b;
    }
    for(i=1;i<=n;i++)
    for(j=1;j<n;j++)
    for(k=j+1;k<=n;k++)if(m[j][i]&&m[k][i])
                           if(m[j][k])br++;
    cout<<br<<"\n";
    //system("pause");
    return 0;
}                       
