Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

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

C. Array

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputChris the Rabbit has been interested in arrays ever since he was a child. At the moment he is researching arrays with the length of *n*, containing only integers from 1 to *n*. He is not good at math, that's why some simple things drive him crazy. For example, yesterday he grew keen on counting how many different beautiful arrays there are. Chris thinks that an array is beautiful if it meets one of the two conditions:

- each elements, starting from the second one, is no more than the preceding one
- each element, starting from the second one, is no less than the preceding one

Having got absolutely mad at himself and at math, Chris came to Stewie and Brian to ask them for help. However, they only laughed at him and said that the answer is too simple and not interesting. Help Chris the Rabbit to find the answer at last.

Input

The single line contains an integer *n* which is the size of the array (1 ≤ *n* ≤ 10^{5}).

Output

You must print the answer on a single line. As it can be rather long, you should print it modulo 1000000007.

Examples

Input

2

Output

4

Input

3

Output

17

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Mar/25/2017 16:25:06 (c2).

Desktop version, switch to mobile version.
User lists

Name |
---|