#include<iostream>
#include<cmath>
#define MAXN 1024
using namespace std;
int main(){
	int a[MAXN][3];
	int n,ans = 0;
	cin >> n;
	for (int i = 0;i < n;i++)
		cin >> a[i][0] >> a[i][1] >> a[i][2];
	for (int i = 0;i < n-1;i++){
		for (int j = i+1;j < n;j++){
			if(abs(a[i][1] - a[j][1]) <= 5 &&
			abs(a[i][2] - a[j][2]) <= 5 &&
			abs(a[i][0] - a[j][0]) <= 5 &&
			abs(a[i][0] - a[j][0]) + abs(a[i][1] - a[j][1]) + abs(a[i][2] - a[j][2]) <= 10)
				ans++;
		}
	}
	cout << ans << endl;
	return 0;
}