The plugin is the simple calculator which is able to calculate result of simple expressions. Result of calculation returns by command !calculator <expression>. Action can be:
+ Addition;
- Subtraction;
* Multiplication;
/ (or :, or \) Division;
^ Exponentiation.
Also instead of numbers and action there can be the simple expression consisting of numbers, signs on actions and brackets.
The inquiry on the calculator is accessible by command !calkulator without the parameters.