//#include <cstdio>
#include <iostream>
//#include <cstdlib>
//#include <windows.h>
//#include <Windowsx.h>
//#include <process.h>
//#include <winnt.h>
//#include <stddef.h>
//#include <fstream>
//#include <cmath>
//#include <iomanip>
//#include <cstring>
using namespace std;
int score[1001] , a[1001] , b[1001] , c[1001] , ans[1001];
int main(){
	int cnt=0 , n;
	cin >> n;
	for(int i=1;i <= n;i++){
		cin >> a[i] >> b[i] >> c[i];
		score[i] = a[i] + b[i] + c[i];
	}
	for(int i=1;i <= n;i++){
		for(int j=1;j <= n;j++){
			if(a[i] - a[j] >= -5 && a[i] - a[j] <= 5 &&
			   b[i] - b[j] >= -5 && b[i] - b[j] <= 5 &&
			   c[i] - c[j] >= -5 && c[i] - c[j] <= 5 &&
			   score[i] - score[j] >= -10 && score[i] - score[j] <= 10){
				ans[i]++;
			}
		}
	}
	for(int i=1;i <= n;i++){
		cnt += ans[i];
	}
	cnt /= 2;
	cnt -= 1;
	cout << cnt;
	return 0;
}