#include<iostream>
#include<cmath>
# include <stdio.h>
using namespace std;
int a[1006],b[1006],c[1006],d[1006];
int e=0;
int main(){
	int w;
	cin>>w;
	;
	for(int q=0;q<=w;q++){
		cin>>a[q]>>b[q]>>c[q];
		d[q]=a[q]+b[q]+c[q];	
	}
	for(int q=0;q<=w;q++){
		for(int v=q+1;v<=w;v++){
			if((abs(a[q]-a[v]<=5))&&
			(abs(b[q]-b[v]<=5))&&
			(abs(c[q]-c[v]<=5))&&
			(abs(d[q]-d[v]<=10))){
				e++;
			}
		}
	}
	cout<<e;
	return 0;	
}