#include<stdio.h>
#include<math.h>
int main()
{
    int n;
    scanf("%d",&n);
    int yuwen[1000],shuxue[1000],yingyu[1000];
    int i,j,k,l,r;
    for(i=0;i<n;i++)
    {
        scanf("%d%d%d",&yuwen[i],&shuxue[i],&yingyu[i]);
    }
    k=0;
    for(i=0;i<n-1;i++)
    {
        for(j=i+1;j<n;j++)
        {
            if(fabs(yuwen[i]-yuwen[j])<=5&&fabs(shuxue[i]-shuxue[j])<=5&&fabs(yingyu[i]-yingyu[j])<=5&&fabs(yuwen[i]+shuxue[i]+yingyu[i]-yuwen[j]-yingyu[j]-shuxue[j]<=10))
               {
                   k++;
               }
        }
    }
    printf("%d",k);
    return 0;
}