#include<bits/stdc++.h>
using namespace std;
int arr[1010][1010];
int main(){
    int n, x , y, z;
    cin >> n;
    int ans = 0;
    for(int i = 0;i < n;i++)
    {
        for (int j = 0; j< 3;j++){
        cin >> arr[i][j];}
    }
    for (int k = 0;k < n ;k++){
        for(int p = 0; p<n;p++){
        int a = arr[k][0] - arr[p][0];
        int b = arr[k][1] - arr[p][1];
        int c = arr[k][2] - arr[p][2];
        int sum = a+b+c;
        if(a<=5&&a>=-5&&b<=5&&b>=-5&&c<=5&&c>=-5&&sum<10&&sum>=-10)
            ans++;
        }
    }
    int ret = (ans-n +1)/2;
    cout << ret;
    return 0;
}