#include<bits/stdc++.h>
using namespace std;
int n,ans=0;
struct ll{
    int chinese,maths,english,score;
}a[105];
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
    	cin>>a[i].chinese>>a[i].maths>>a[i].english;
    	a[i].score=a[i].chinese+a[i].english+a[i].maths;
	}
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=n;j++){
    		if(j!=i) if(abs(a[i].score-a[j].score)<=10 && abs(a[i].chinese-a[j].chinese)<=5 && abs(a[i].english-a[j].english)<=5 && abs(a[i].maths-a[j].maths)<=5) ans++;
		}
	}
	cout<<ans/2;
    return 0;
}