#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,g,a[1001];
	int x[1001],y[1001],z[1001];
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>x[i]>>y[i]>>z[i];
		a[i]=x[i]+y[i]+z[i];
	}
	for(int j=1;j<=n;j++)
	{
		for(int k=1;k<j;k++)
		{
			if(a[k]-a[j]<=10||a[j]-a[k]<=10)
			{
				if(x[j]-x[k]<=5||x[k]-x[j]<=5)
				{
					if(y[j]-y[k]<=5||y[k]-y[j]<=5)
					{
						if(z[j]-z[k]<=5||z[k]-z[j]<=5)
						{
							g++;
						}
					}
				}
			}
		}
	}
	cout<<g;
	return 0;
}