#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, a[1010][6];
    int ans = 0;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i][0] >> a[i][1] >> a[i][2];
        a[i][3] = a[i][0] + a[i][1] + a[i][2];
    }
    for (int i = 1; i <= n; i++) {
        for (int j = i + 1; j <= n; j++) {
            if (abs(a[i][0] - a[j][0]) <= 5 && 
                abs(a[i][1] - a[j][1]) <= 5 &&
                abs(a[i][2] - a[j][2]) <= 5 &&
                abs(a[i][3] - a[j][3]) <= 10) {
                ans++;
            }
        }
    }
    cout << ans << endl;
    return 0;
}