#include<iostream>
#include<cmath>
using namespace std;
int main(){
    int a[1001],b[1001],c[1001],n,ans=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i]>>b[i]>>c[i];
    }
    for(int i=1;i<=n;i++){
        for(int j=i+1;j<=n;j++){
            if(abs(a[i]-a[j])<=5&&abs(c[i]-c[j])<=5&&abs(b[i]-b[j])<=5&&abs((a[i]+b[i]+c[i])-(a[j]+b[j]+c[j]))<=10){
                ans++;
            }
        }
    }
    cout<<ans;
}