#include<stdio.h>
#include<math.h>
int main(){
	int n, i, j;
	int x[1000], y[1000], z[1000];
	int cnt=0;
	scanf("%d", &n);
	for(i=0;i<n;i++){
		scanf("%d%d%d", &x[i], &y[i], &z[i]);
	}
	for(i=0;i<n-1;i++){
		for(j=i+1;j<n;j++){
			if((fabs(x[j]-x[i])<=5||fabs(y[j]-y[i])<=5||fabs(z[j]-z[i])<=5)&&fabs(x[j]+y[j]+z[j]-x[i]-y[i]-z[i])<=10){
				cnt++;
			}
		}
	}
	printf("%d", cnt);
	return 0;
}