#include<stdio.h>
#include<math.h>
int main(void)
{
	int i, j = 2, a[100][3], b[100] = { 0 }, N, t = 0, m;
	scanf("%d", &N);
	for (i = 0; i < N; i++)
	{
		for (j = 0; j < 3; j++)
			scanf("%d", &a[i][j]);
	}
	for (i = 0, j = 0; i < N; i++)
		b[i] = a[i][j] + a[i][j + 1] + a[i][j + 2];
	for (i = 0; i < N; i++)
	{
		for (m = i+1; m < N; m++)
		{
			if (abs(a[i][0] - a[m][0]) <= 5 && abs(a[i][1] - a[m][1]) <= 5 && abs(a[i][2] - a[m][2]) <= 5 && abs(b[i] - b[m]) <= 10)
				t += 1;
		}
	}
	printf("%d", t);
	return 0;
}