#include<iostream>
#include<math.h>
using namespace std;

int main()
{
	int n, count = 0;
	cin >> n;
	int (*a)[3] = new int[n][3];
	int* sum = new int[n];
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < 3; j++)
		{
			cin >> a[i][j];
			sum[i] = a[i][j];
		}
	}
	for (int i = 0; i < n; i++)
	{
		for (int j =i+1 ; j < 3; j++)
		{
			if (abs(a[i][0] - a[j][0]) <= 5 &&
				abs(a[i][1] - a[j][1]) <= 5 &&
				abs(a[i][2] - a[j][2]) <= 5 &&
				abs(sum[i] - sum[j]) <= 10)
				count++;
		}
	}
	cout << count << endl;
	delete[]sum;
	delete[]a;
	return 0;
}