#include<bits/stdc++.h>

using namespace std;

const int N = 1002;

int main()
{
	int n;
	cin >> n;
	int a[N][3], score[N], cnt = 0;
	for (int i = 0; i < n; i++)
		for (int j = 0; j < 3; j++)
		{
			cin >> a[i][j];
			score[i] += a[i][j];
		}
		
	for (int i = 0; i < n; i++)
	{
		for (int j = i + 1; j < n; j++)
		{
			if (abs(score[i] - score[j]) > 10) break;
			else
			{
				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) cnt++;
			}
		}
	}

	cout << cnt;

	system("pause");
	return 0;
}