rt:

#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int n,cnt;
struct s
{
    int ch;
    int ma;
    int en;
}arr[1001];
int main()
{
    scanf("%d",&n);
    for (int i=1;i<=n;i++)
        scanf("%d%d%d",&arr[i].ch,&arr[i].ma,&arr[i].en);
    for (int i=1;i<=n;i++)
    {
        for (int j=i+1;j<=n;j++)
        {
            if (abs(arr[i].ch-arr[j].ch)<=5 and abs(arr[i].ma-arr[j].ma)<=5 and abs(arr[i].en-arr[j].en)<=5 and abs(arr[i].ch-arr[j].ch)+abs(arr[i].en-arr[j].en)+abs(arr[i].ma-arr[j].ma)<=10)
                cnt++;

        }
    }
    printf("%d",cnt);
}