include <bits/stdc++.h>

using namespace std; int a[1005][5];

int main() {

int n;
cin >> n;
for (int i = 1; i <= n; i++) {
	cin >> a[i][1] >> a[i][2] >> a[i][3];
	a[i][4] = a[i][1] + a[i][2] + a[i][3];
}
int x = 0;

for (int i = 1; i <= n; i++) {
	for (int j = i + 1; j <= n; j++) {
		if (abs(a[i][4] - a[j][4]) <= 10 && abs(a[i][1] - a[j][1]) <= 5 && abs(a[i][2] - a[j][2]) <= 5
		        && abs(a[i][3] - a[j][3]) <= 5) {
			x++;
		}
	}
}
cout << x;
return 0;

}