#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin>>n;
   int yu[1005],shu[1005],ying[1005],sum=0,ans=0;
    for(int i=1;i<=n;i++){
    cin>>yu[i]>>shu[i]>>ying[i];
    sum=yu[i]+shu[i]+ying[i];
}
for(int i=1;i<=n;i++)
{
    for(int j=i+1;j<=n;j++){
        if((abs(yu[i]-yu[j])<=5&&
        abs(shu[i]-shu[j])<=5&&
        abs(ying[i]-ying[j])<=5)&&sum[i]-sum[j]<=10)
        ans++;
    }
    cout<<ans;
    return 0;
}
}