Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only 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

The problem statement has recently been changed. View the changes.

×
E. Count The Rectangles

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThere are $$$n$$$ segments drawn on a plane; the $$$i$$$-th segment connects two points ($$$x_{i, 1}$$$, $$$y_{i, 1}$$$) and ($$$x_{i, 2}$$$, $$$y_{i, 2}$$$). Each segment is non-degenerate, and is either horizontal or vertical — formally, for every $$$i \in [1, n]$$$ either $$$x_{i, 1} = x_{i, 2}$$$ or $$$y_{i, 1} = y_{i, 2}$$$ (but only one of these conditions holds). Only segments of different types may intersect: no pair of horizontal segments shares any common points, and no pair of vertical segments shares any common points.

We say that four segments having indices $$$h_1$$$, $$$h_2$$$, $$$v_1$$$ and $$$v_2$$$ such that $$$h_1 < h_2$$$ and $$$v_1 < v_2$$$ form a rectangle if the following conditions hold:

- segments $$$h_1$$$ and $$$h_2$$$ are horizontal;
- segments $$$v_1$$$ and $$$v_2$$$ are vertical;
- segment $$$h_1$$$ intersects with segment $$$v_1$$$;
- segment $$$h_2$$$ intersects with segment $$$v_1$$$;
- segment $$$h_1$$$ intersects with segment $$$v_2$$$;
- segment $$$h_2$$$ intersects with segment $$$v_2$$$.

Please calculate the number of ways to choose four segments so they form a rectangle. Note that the conditions $$$h_1 < h_2$$$ and $$$v_1 < v_2$$$ should hold.

Input

The first line contains one integer $$$n$$$ ($$$1 \le n \le 5000$$$) — the number of segments.

Then $$$n$$$ lines follow. The $$$i$$$-th line contains four integers $$$x_{i, 1}$$$, $$$y_{i, 1}$$$, $$$x_{i, 2}$$$ and $$$y_{i, 2}$$$ denoting the endpoints of the $$$i$$$-th segment. All coordinates of the endpoints are in the range $$$[-5000, 5000]$$$.

It is guaranteed that each segment is non-degenerate and is either horizontal or vertical. Furthermore, if two segments share a common point, one of these segments is horizontal, and another one is vertical.

Output

Print one integer — the number of ways to choose four segments so they form a rectangle.

Examples

Input

7 -1 4 -1 -2 6 -1 -2 -1 -2 3 6 3 2 -2 2 4 4 -1 4 3 5 3 5 1 5 2 1 2

Output

7

Input

5 1 5 1 0 0 1 5 1 5 4 0 4 4 2 4 0 4 3 4 5

Output

0

Note

The following pictures represent sample cases:

Codeforces (c) Copyright 2010-2021 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Sep/17/2021 18:56:56 (f1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|