# include <iostream>
# include <stdio.h>
# include <math.h>

using namespace std;
int main()
{
    int n;
    cin>>n;
    int a[1010][4]={};
    int ans=0;
    for(int i=1;i<=n;i++)//读入数据
    {
        cin>>a[i][1];
        cin>>a[i][2];
        cin>>a[i][3];
        a[i][4]=a[i][1]+a[i][2]+a[i][3];
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=i+1;j<=n;j++)
        {
            if(abs(a[i][1]-a[j][1])<=5&&abs(a[i][2]-a[j][2])<=5&&abs(a[i][3]-a[j][3])<=5&&abs(a[i][4]-a[i][4])<=10)//绝对值!!
            {
            ans++;
            //cout<<"ans="<<ans<<" ";
            //cout<<"a["<<i<<"]"<<" "<<"a["<<j<<"]"<<endl;
            }


        }
    }
    cout<<ans<<endl;
    return 0;
}