#include <stdio.h>
#include <math.h>
int main()
{
    int times,time;
    int n=0,i,j;
    int score[10058][5];
    scanf("%d",&times);
    for(time=1;time<=times;time++)
        scanf("%d%d%d",&score[time][1],&score[time][2],&score[time][3]);
    for(time=1;time<=times;time++)
        score[time][4]=score[time][1]+score[time][2]+score[time][3];
    for(i=1;i<times;i++)
        for(j=i+1;j<=times;j++)
            if(fabs(score[i][1]-score[j][1])<=5&&
            fabs(score[i][2]-score[j][2])<=5&&
            fabs(score[i][3]-score[j][3])<=5&&
            fabs(score[i][4]-score[j][4])<=10)
            n++;
    printf("%d",n);
    return 0;
}//