#include<iostream>
using namespace std;
int main()
{
	int chi[1001],math[1001],eng[1001];
	int i,n;
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cin>>chi[i]>>math[i]>>eng[i];
		
	}
	int ans=0;
	for(i=1;i<=n;i++)
	{
		for(int j=i+1;j<=n;j++)
		{
			if(chi[i]-chi[j]>=-5&&chi[i]-chi[j]<=5&&math[i]-math[j]>=-5&&math[i]-math[j]<=5&&eng[i]-eng[j]>=-5&&eng[i]-eng[j]<=5&&chi[i]+math[i]+eng[i]-chi[j]-math[j]-eng[j]>=-5&&chi[i]+math[i]+eng[i]-chi[j]-math[j]-eng[j]>=-5&&chi[i]+math[i]+eng[i]-chi[j]-math[j]-eng[j]<=5)
			ans++; 
		}
	}
	cout<<ans;
}