#include<iostream>
using namespace std;
int a[1001],b[1001],c[1001],d[1001];
	int w=0;
int main()
{
	int n,i;
	cin>>n;
	
	for(i=1;i<=n;i++){
		cin>>a[i]>>b[i]>>c[i];
	}
	d[i]=a[i]+b[i]+c[i];
	for(i=1;i<=n;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){
				w++;
			}
		}
	}
	cout<<w<<endl;
	return 0;
}