PROGRAMMING:Calculate factorial sum
For the given positive integer $$n $$, you need to calculate $$s = 1+ 2! + 3! + ... + N!$$。
###Input format:
Input to give a positive integer of no more than 10 $$n $$in one line.
###Output format:
Output the value of $$s $$on one line.
###Input example:
```in
three
```
###Output example:
```out
nine
```
answer：If there is no answer, please comment
###Input format:
Input to give a positive integer of no more than 10 $$n $$in one line.
###Output format:
Output the value of $$s $$on one line.
###Input example:
```in
three
```
###Output example:
```out
nine
```
answer：If there is no answer, please comment