include

include

using namespace std;

int main() {

int n;
cin >> n;
int a[n][3];
for (int i = 0; i < n; i++) {
	for (int j = 0; j < 3; j++) {
		cin >> a[i][j];
	}
}
int num = 0;
for (int i = 0; i < n - 1; i++) {
	for (int j = i + 1; j < n; j++) {
		int sum1 = 0, sum2 = 0, count = 0;
		for (int k = 0; k < 3; k++) {
			sum1 += a[i][k];
			sum2 += a[j][k];
			if (abs(a[i][k] - a[j][k]) <= 5) {
				count++;
			}
		}
		if (count == 3 && abs(sum1 - sum2) <= 10) {
			num++;
		}

	}
}
cout << num;
return 0;

}