#include <iostream> //万能头
using namespace std;
int main()
{
    
    int N, a[10001], b[10001], c[10001], sum, sum1, sum2, sum3, n = 0;
    cin >> N;
    for (int i = 1; i<=N;i++)
    {
        cin >> a[i] >> b[i] >> c[i];

        for (int j = 1; j < i; j++)
        {
            sum = a[j] + b[j] + c[j] - a[i] - b[i] - c[i];
            sum1 = a[j] - a[i];
            sum2 = a[j] - a[i];
            sum3 = a[j] - a[i];
            if ((sum1 >= -5 && sum1 <= 5) && (sum >= -10 && sum <= 10) && (sum2 >= -5 && sum2 <= 5) && (sum3 >= -5 && sum3 <= 5))
            {
                n += 1;
            }
    }
}
cout << n;
return 0;
}