#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,y[165],s[165],x[165],ans=0,sum[666];
    cin>>n;
    for(int i=1;i<=n;i++){
    cin>>y[i]>>s[i]>>x[i];
    sum[i]=y[i]+s[i]+y[i];
	}
    for(int i=1;i<=n;i++){
    	for(int j=i+1;j<=n;j++){
    		if(abs(y[j]-y[i])<=5&&abs(s[j]-s[i])<=5&&abs(x[j]-x[i])<=5&&abs(sum[j]-sum[i])<=10)ans++;
		}
    }
    cout<<ans;
	return 0;
}

万紫千红总是春