Number of posts in each category

Please excuse my English, I’ll try to be as explicit as possible

I need a plugin or something like it to display the number of posts in each Category. (betwen () – near the category’s name)

Example:

Categories:

Abv (3)
Cat (5)
Dog (6)
Uncategorized (7)
…………

This number of posts is ussualy shown, but not for the theme I am currently using (dipdolt-v1-10). I like this theme alot and I wish I could keep it.

Thank you!