#include <iostream>
#include <fstream>

using namespace std;

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

struct number
{
    int p2, p3, p5;
};

int n, k;

number v[100002];

void cit()
{
    fin>>n;

    for (int i=1; i <= n; ++i)
    {
        fin>>v[i].p2>>v[i].p3>>v[i].p5;
    }
}

void rez()
{
    for (int i=1; i <= n; ++i)
    {
        for (int j=i+1; j <= n; ++j)
        {
            int p2, p3, p5;

            p2 = v[i].p2 + v[j].p2;
            p3 = v[i].p3 + v[j].p3;
            p5 = v[i].p5 + v[j].p5;

            int norm = p2;

            if ((p2 == norm || !p2) && (p3 == norm || !p3) && (p5 == norm || !p5))
                k++;
        }
    }

    fout<<k;
}

int main()
{
    cit();

    rez();

    return 0;
}