#include <iostream>
#include <fstream>
#include <cmath>
#include <iomanip>


using namespace std;

ifstream fin ("triang.in");
ofstream fout ("triang.out");

double v[3001];

int main()
{
    int i,j,k,n,cnt;
    float l1,l2,l3;
    fin >> n;
    for(i=1;i<=n*2;i++)
    {
        fin >> v[i++];
        fin >> v[i];
    }
    cnt=0;
    for(i=1;i<=(n<<1)-1;i+=2)
        for(j=i+2;j<=(n<<1)-1;j+=2)
            for(k=j+2;k<=(n<<1)-1;k+=2)
            {
                l1=sqrt((v[i]-v[j])*(v[i]-v[j])+(v[i+1]-v[j+1])*(v[i+1]-v[j+1]));
                l2=sqrt((v[i]-v[k])*(v[i]-v[k])+(v[i+1]-v[k+1])*(v[i+1]-v[k+1]));
                l3=sqrt((v[j]-v[k])*(v[j]-v[k])+(v[j+1]-v[k+1])*(v[j+1]-v[k+1]));
                int a=l1*1000;
                float b=a%1000;
                b/=1000;
                a=l1;
                l1=a+b;
                a=l2*1000;
                b=a%1000;
                b/=1000;
                a=l2;
                l2=a+b;
                a=l3*1000;
                b=a%1000;
                b/=1000;
                a=l3;
                l3=a+b;
                if(l1==l2 && l2==l3 && l1==l3)
                    cnt++;

            }
    fout << cnt;
    return 0;
}