Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

E. Fox and Meteor Shower

time limit per test

6 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThere is a meteor shower on the sky and there are *n* meteors. The sky can be viewed as a 2D Euclid Plane and the meteor is point on this plane.

Fox Ciel looks at the sky. She finds out that the orbit of each meteor is a straight line, and each meteor has a constant velocity. Now Ciel wants to know: what is the maximum number of meteors such that any pair met at the same position at a certain time? Note that the time is not limited and can be also negative. The meteors will never collide when they appear at the same position at the same time.

Input

The first line contains an integer *n* (1 ≤ *n* ≤ 1000). Each of the next *n* lines contains six integers: *t*_{1}, *x*_{1}, *y*_{1}, *t*_{2}, *x*_{2}, *y*_{2} — the description of a meteor's orbit: at time *t*_{1}, the current meteor is located at the point (*x*_{1}, *y*_{1}) and at time *t*_{2}, the meteor is located at point (*x*_{2}, *y*_{2}) ( - 10^{6} ≤ *t*_{1}, *x*_{1}, *y*_{1}, *t*_{2}, *x*_{2}, *y*_{2} ≤ 10^{6}; *t*_{1} ≠ *t*_{2}).

There will be no two meteors are always in the same position for any time.

Output

Print a single integer — the maximum number of meteors such that any pair met at the same position at a certain time.

Examples

Input

2

0 0 1 1 0 2

0 1 0 1 2 0

Output

2

Input

3

-1 -1 0 3 3 0

0 2 -1 -1 3 -2

-2 0 -1 6 0 3

Output

3

Input

4

0 0 0 1 0 1

0 0 1 1 1 1

0 1 1 1 1 0

0 1 0 1 0 0

Output

1

Input

1

0 0 0 1 0 0

Output

1

Note

In example 1, meteor 1 and 2 meet in *t*=-1 at (0, 0).

In example 2, meteor 1 and 2 meet in *t*=1 at (1, 0), meteor 1 and 3 meet in *t*=0 at (0, 0) and meteor 2 and 3 meet in *t*=2 at (0, 1).

In example 3, no two meteor meet.

In example 4, there is only 1 meteor, and its velocity is zero.

If your browser doesn't support animation png, please see the gif version here:

http://assets.codeforces.com/images/388e/example1.gif

http://assets.codeforces.com/images/388e/example2.gif

http://assets.codeforces.com/images/388e/example3.gif

http://assets.codeforces.com/images/388e/example4.gif

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Aug/19/2017 14:02:51 (p1).

Desktop version, switch to mobile version.

User lists

Name |
---|