#include<bits/stdc++.h>
using namespace std;
int n,a[1000],b[1000],c[1000],d[1000];
int ans=0;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		d[i]+=a[i];
		cin>>b[i];
		d[i]+=a[i];
		cin>>c[i];
		d[i]+=c[i];
	}
	for(int i=1;i<=n-1;i++){
		for(int j=i;i<=n;j++){
			if(d[i]-d[j]<=10||d[j]-d[i]<=10)
				if(a[i]-a[j]<=5||a[j]-a[i]<=5||b[i]-b[j]<=5||b[j]-b[i]<=5||c[i]-c[j]<=5||c[j]-c[i]<=5){
					ans++;
				}
		}
	}
	cout<<ans;
	return 0;
}