#include<cstdio>
# include <stdio.h>
# include <math.h>
using namespace std;
int n, a[1010][5], sum[1010];
int cnt;
int main() 
{
	scanf ("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d%d%d",a[i][1],a[i][2],a[i][3]);
		sum[i] = a[i][1] + a[i][2] + a[i][3];
	}
	for (int i = 1; i <= n; i++)
		for (int j = i + 1; j <= n; j++)
			if (abs (a[i][1] - a[j][1]) <= 5  
				&& abs (a[i][2] - a[j][2]) <= 5 
				&& abs (a[i][3] - a[j][3]) <= 5 
				&& abs (sum[i] - sum[j]) <= 10) 
				cnt++;
	printf("%d",cnt);
	return 0;
}