#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,sum=0;
	cin>>n;
	int a[n+2],b[n+2],c[n+2];
	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)
			{sum++;}
		}
	}
	cout<<sum/2<<endl;
	return 0;
}