#include <iostream>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n,j=0;
    cin>>n;
    int A[n][3];
    for (int i=0;i<=n-1;i++)
    {cin>>A[i][0]>>A[i][1]>>A[i][2];
    }
    for (int k=0;k<n-1;k++)
        for (int t=k+1;t<=n-1;t++)
    {
        if ((fabs(A[k][0]-A[t][0])<=5)&&
               (fabs(A[k][1]-A[t][1])<=5)&&
               (fabs(A[k][2]-A[t][2])<=5)&&
               (fabs(A[k][0]+A[k][1]+A[k][0]-A[t][0]-A[t][1]-A[t][2])<=10))
               j++;
    }
    cout << j<< endl;
    return 0;
}