#include<bits/stdc++.h>
using namespace std;
int main()
{	int n,a[1005],b[1005],c[1005],d[1005],s=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{	cin>>a[i]>>b[i]>>c[i];
		d[i]=a[i]+b[i]+c[i];
	}
	for(int i=1;i<=n-1;i++)
	{	for(int j=i+1;j<=n;j++)
		{	if((abs(a[i]-a[j]<=5)) && (abs(b[i]-b[j]<=5)) && (abs(c[i]-c[j]<=5)) && (abs(d[i]-d[j]<=10)))
			s++;
		}
	}
	cout<<s<<endl;
	return 0;
}