C++ :

#include <iostream>
#include <cmath>

using namespace std;
int main(){
    int ch[1001], ma[1001], en[1001], n;
    cin >> n;
    for(int i = 0; i < n; ++i){
        cin >> ch[i] >> ma[i] >> en[i];
    }

    int cnt = 0;
    for(int i = 0; i < n; ++i){
        int c1 = ch[i];
        int m1 = ma[i];
        int e1 = en[i];
        int t1 = c1 + m1 + e1;
        for(int j = i + 1; j < n; ++j){
            int c2 = ch[j];
            int m2 = ma[j];
            int e2 = en[j];
            int t2 = c2 + m2 + e2;
            if(abs(c1 - c2) <= 5 && abs(m1 - m2) <= 5 && abs(e1 - e2) <= 5 && abs(t1 - t2) <= 10){
                cnt++;
            }
        }
    }

    cout << cnt << endl;
    return 0;
}