PROGRAMMING:Please n!

This is a programming problem template. Please write the title description here. For example: this topic requires n!.
###Input format:
Please write the input format here. For example, input gives 5 in one line.
###Output format:
Please describe the output format here. For example, for each group of inputs, output the value of a + B in one line.
###Input example:
Here is a set of inputs. For example:
```in
five
```
###Output example:
The corresponding output is given here. For example:
```out
5!= one hundred and twenty
```







answer：If there is no answer, please comment