#include<stdio.h>
#include<stdlib.h>
#include<iostream>

using namespace std;

int main()
{
	int n;
	int sum[1000] = {0};
	int Num = 0;
	cin >> n;

	int(*ptr)[3] = NULL;

	ptr = (int(*)[3])malloc(n * sizeof(int*));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < 3; j++) {
			cin >> ptr[i][j];
			sum[i] += ptr[i][j];
		}
	}

	for (int i = 0; i < n-1; i++) {
		for (int j = i + 1; j < n; j++) {
			if (abs(ptr[i][0] - ptr[j][0]) <= 5 && abs(ptr[i][1] - ptr[j][1]) <= 5 && abs(ptr[i][1] - ptr[j][1]) <= 5 && abs(sum[i] - sum[j]) <= 10)
				++Num;
		}
	}

	cout << Num;

	return 0;
}