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