Request... sum command

[debelah]

Hello,

If I enter the number ‘a’, can I add a to the existing data for output?
ex: !add 50
= Added 50 to 250.

sorry for my english

[RokettoJanpu]

Refer to this thread:

Adding a command that adds the amount specified to a counter

As the title says, I want a command that adds the amount I enter into the counter. Something like !add 5000, and it would add 5000. So when I type !counter it would show 5000.