#include<bits/stdc++.h>
#include<cstdio>

using namespace std;

struct xxs
{
	int c,m,e;	
	int num;
};

int main() 
{
	int n;
	int sum = 0;
	xxs a[1000 + 5];
	cin>>n;
	
	for(int i = 1;i <= n;i++)
	{
		cin>>a[i].c>>a[i].m>>a[i].e;
		a[i].num =a[i].c + a[i].m + a[i].e;
		for(int l = 0 ;l < i;l++)
		{
			if(max(a[i].c,a[l].c) - min(a[i].c,a[l].c)  <= 5 && (max(a[i].m,a[l].m) - min(a[i].m,a[l].m) && max(a[i].e,a[l].e) - min(a[i].e,a[l].e)  <= 5))
			{
				if(max(a[l].num,a[i].num) - min(a[l].num,a[i].num) <= 10) sum++;
			} 
		}
		
	}
	
	cout<<sum<<endl;
	
	return 0;
}