一绿四红

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