#include<stdio.h>
int g[100][3];
int main() {
	int a, i, j, x, db = 0;
	scanf("%d", &x);
	for (i = 0; i < x; i++)
	{
		for (j = 0; j < 3; j++)
		{
			scanf("%d", &g[i][j]);
		}
	}
	for (int n = 0; n < x - 1; n++)
	{
		for (int m = 1; m < x; m++) {
			int p = 0,sum=0;
			for (a = 0; a < 3; a++)
			{
				int d = g[n][a] - g[m][a];
				if (d >= 0) d = d;
				else d = -d;
				if (d>5)
					break;
				else {
					sum += d;
					p++;
				}
			}
			if ((sum <= 10) && (p==3))
				db += 1;
		}
	}
	printf("%d", db);
	return 0;
}