PROGRAMMING:Exhaustive factorization
Input a positive integer n value (n does not exceed 20), programming output n（ N). Please define the integer in the program as long long type.
###Input example:
```in
five
```
###Output example:
```out
5!= one hundred and twenty
```
###Input example:
```in
six
```
###Output example:
```out
6!= seven hundred and twenty
```
answer：If there is no answer, please comment
###Input example:
```in
five
```
###Output example:
```out
5!= one hundred and twenty
```
###Input example:
```in
six
```
###Output example:
```out
6!= seven hundred and twenty
```
answer：If there is no answer, please comment