#include<bits/stdc++.h>
using namespace std;
int a[1002],b[1002],c[1002],d[1002],s,n;
int main(){
	//freopen("b.in","r",stdin);
	//freopen("b.out","w",stdout);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i]>>c[i];
		d[i]=a[i]+b[i]+c[i];
	}
	for(int i=1;i<=n;i++){
		for(int j=i;j>=1;j--){
			if(abs(a[i]-a[j])<=5&&abs(b[i]-b[j])<=5&&abs(c[i]-c[j])<=5&&abs(d[i]-d[j])<=10)
				s++;
		}
	}
	cout<<s;
	//fclose(stdin);fclose(stdout);
	return 0;
}