#include <iostream>
#include <cmath>
using namespace std;
int main()
{
	int N;
	cin >> N;
	int a[1001], b[1001], c[1001],sum[1001],s=0;
	for (int i = 0; i < N; i++)
	{
		cin >> a[i] >> b[i] >> c[i];
		sum[i] = a[i] + b[i] + c[i];
	}
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < i; j++)
		{
			if (abs(a[i] - a[j] <= 5) && abs(b[i] - b[j] <= 5) && abs(c[i] - c[j] <= 5) && abs(sum[i] - sum[j] <= 10))
				s++;
		}
	}
	cout << s;
}