Theater

Time Limit: 1000 ms Memory Limit: 65536 KiB

Problem Description

There are 2n people queuing in line waiting for entering the theater. The entrance fee is 5 yuan. There are n people possess 5 yuan, the other n people possess 10 yuan. You are to calculate that when the latter people(with 10 yuan) handing in the money to the ticket office, the ticket office can change the money. (FYI, when the ticket office have 5 yuan, it can change the money.)
 

Input

Multiple numbers, and read till the end of the file(EOF). Each line contains a number, indicate the number n. ( n <= 14 )
 

Output

The answer.
 

Sample Input

1
2
3
4
5
6
7

Sample Output

1
1
2
5
14
42
132

Hint

 

Source

zhengnanlee