#include<iostream>
# include <math.h>
using namespace std;
int a[1010],b[1010],c[1010],sum[1010];
int main()
{
	int n,result=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i]>>c[i];
		sum[i]=a[i]+b[i]+c[i];
	}
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			if(abs(a[j]-a[i]<=5)&&
			abs(b[j]-b[i]<=5)&&
			abs(c[j]-c[i]<=5)&&
			abs(sum[j]-sum[i]<=10))
			result++;
		}
	}
	cout<<result;
    return 0;
}