#include<bits/stdc++.h>
using namespace std;
int main()
{
 int a[1010],b[1010],c[1010],sum[1010],n,s=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i]>>b[i]>>c[i];
        sum[i]=a[i]+b[i]+c[i];
    }
    for(int i=1;i<=n;i++){
        for(int j=i+1;j<=n;j++){
            if(a[j]-a[i]<=5&&b[j]-b[i]<=5&&c[j]-c[i]<=5&&sum[j]-sum[i]<=10)
            s++;
        }
    }
    cout<<s;
    return 0;
}