PROGRAMMING:Find the sum of odd numbers from 1 to n.

Find the sum of odd numbers from 1 to positive integer n, and wrap the output line.
###Input format:
Enter a positive integer.
###Output format:
Output the result and wrap it.
###Input sample 1:
```in
one hundred
```
###Output sample 1:
```out
two thousand and five hundred
```
###Input sample 2:
```in
ninety-nine
```
###Output sample 2:
```out
two thousand and five hundred
```







answer：If there is no answer, please comment