#include <iostream>
using namespace std;
int main()
{
	int n,sum=0,flag=0;
	cin >> n;
	int score[1000][3];
	int sumscore[1000]={0};
	for (int i = 1; i <= n; i++)
	{
		for(int j=1;j<=3;j++)
		cin >> score[i][j];
	}
	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= 3; j++)
			sumscore[i] += score[i][j];
	}
	for (int i = 1; i < n; i++)
	{
		for (int k = i + 1; k <= n; k++)
		{
			for (int j = 1; j <= 3; j++)
			{
				if (abs(score[i][j] - score[k][j]) <= 5 && abs(sumscore[i] - sumscore[k] <= 10))flag++;
				else flag = 0;
			}
			if (flag == 3)sum++;
			flag = 0;
		}
	}
	cout << sum;
	return 0;
}