#include<iostream>
#include<cmath>
using namespace std;
int main()
{
	int n,grade[1000][3],sum[3];
	cin>>n;
	for(int i=0;i<3;i++) sum[i]=0;
	for(int i=0;i<n;i++){
		for(int j=0;j<3;j++){
			cin>>grade[i][j];
			sum[i] += grade[i][j];
		}
	}

	int num=0;
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			if(abs(grade[i][0]-grade[j][0])<=5&&
				abs(grade[i][1]-grade[j][1])<=5&&
				abs(grade[i][2]-grade[j][2])<=5&&
				abs(sum[i]-sum[j])<=10) num++;
		}
	}
	cout<<num;
	return 0;
}