#include<bits/stdc++.h>
using namespace std;
int tu[10001],su[10001],yu[10001];
int main()
{
	int t,s,y,n,u,q,c1,c2,c3,qi=0;
	q=0-10;
	cin>>n;
	for(int i=1;i<=n;i+=1)
	{
		cin>>t>>s>>y;
		tu[i]=t;
		su[i]=s;
		yu[i]=y;
	}
	for(u=1;u<=n;u+=1)
	{
		for(int p=u;p<=n;p+=1)
		{
			int o=0,e,c;
		    e=p+1;
		    cout<<e;
			o=o+tu[u]-tu[e];
			o=o+su[u]-su[e];
			o=o+yu[u]-yu[e];
			if(o<=10||o>=q)
			{
				c1=tu[u]-tu[e];
				c2=su[u]-su[e];
				c3=yu[u]-yu[e];
				if(c1<=5&&c2<=5&&c3<=5)
				{
					qi+=1;
				}
			}
		}
	}
	cout<<qi;
	return 0;
}