#define _CRT_SECURE_NO_DEPRECATE
#include <iostream> 
#include <string>
#include <vector>
#include <sstream>
#include <queue>
#include <algorithm>
#include <iomanip>
#include <map>
#include <set>
#include <math.h>
#include <stack>
#include <deque>
#include <numeric>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <bitset>
#define mpair make_pair
#define all(v) v.begin(),v.end()
using namespace std;
typedef long long ll;
typedef long double ld;
const ld epsylon = 1e-9;

ll get(int ax, int ay, int bx, int by) {
  return ((ll)ax- (ll)bx) * ((ll)ax- (ll)bx) + ((ll)ay- (ll)by) * ((ll)ay- (ll)by);
}

long long evkl(long long a,long long b)
{
  long long r;
  if(b>a)
    swap(b,a);
  if(a==0)
  {
    if(b!=0)
      return b;
    else
      return 1;
  }
  if(b==0)
    return a;
  while(a%b)
  {
    r=a%b;
    a=b;
    b=r;
  }
  return b;
}
long long comb(int n,int k)
{
  long long res=1,tmp,a,b;
  if(k==0)
    return 1;
  for(int i=0;i<k;i++)
  {
    a=n-i;
    b=i+1;
    tmp=evkl(a,b);
    b/=tmp;
    a/=tmp;
    res/=b;
    res*=a;
  }
  return res;
}

int main()
{
  freopen("tri.in","r",stdin);
  freopen("tri.out", "w", stdout);

  int n;
  cin >> n;
  
  map<pair<ll, ll>, int> met;
  map<pair<ll, ll>, int>::iterator it;
  for (int i=0;i<n;++i) {
    int ax, ay;
    int bx, by;
    int cx, cy;

    scanf("%d %d %d %d %d %d", &ax, &ay, &bx, &by, &cx, &cy);

    ll a = get(cx,cy, bx,by);
    ll b = get(ax,ay, cx,cy);
    ll c = get(ax,ay, bx,by);

    if ( a == b ) {
      ll d = evkl(a, c);
      pair<ll, ll> ratio(a/d,c/d);
      it = met.find(ratio);
      if (it == met.end()){
        met.insert(mpair(ratio, 1));
      } else {
        it->second+=1;
      }
    } else if (b == c) {
      ll d = evkl(a, b);
      pair<ll, ll> ratio(b/d,a/d);
      it = met.find(ratio);
      if (it == met.end()){
        met.insert(mpair(ratio, 1));
      } else {
        it->second+=1;
      }
    } else if (c == a) {
      ll d = evkl(c, b);
      pair<ll, ll> ratio(c/d,b/d);
      it = met.find(ratio);
      if (it == met.end()){
        met.insert(mpair(ratio, 1));
      } else {
        it->second+=1;
      }
    }
  }

  int res = 0;
  for (it = met.begin(); it != met.end(); ++it) {
    if (it->second > res) {
      res =it->second;
    }
  }

  cout << res << endl;
  return 0;
}