#include<iostream>
#include<cmath>
using namespace std;
int main()
{
	int n,a[1001],b[1001],c[1001],ans=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i]>>b[i]>>c[i];
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
		if(abs(a[i]-a[j])<=5&&abs(b[i]-b[j])<=5&&abs(c[i]-c[j])<=5&&abs((a[i]+b[i]+c[i])-(a[j]+b[j]+c[j]))<=10)
		{
			ans++;
			}	
		}
	}
	cout<<ans;
	return 0;
 }