#include <stdio.h>
int main()
{
    int n = 0;
    scanf("%d", &n);
    int a[1100][4] = { 0 };
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < 3; j++)
        {
            scanf("%d", &a[i][j]);
            a[i][3] += a[i][j];
        }
    }
    
    
    int count = 0;
    for (int i = 0; i < n; i++)
    {
        
        for (int j = i+1; j < n; j++)
        {
          
            if (a[i][3] + 10 < a[j][3] || a[i][3] - 10 > a[j][3])
                break;
            int w = 2;
            int flag = 0;
            while (w >= 0)
            {
                if (a[i][w] + 5 < a[j][w] || a[i][w] - 5 > a[j][w])
                {
                   flag = 1;
               }
                w--;
            }
            if (flag == 0)
                count++;
        }
        
    }
    printf("%d", count);
    return 0;
}