VERY very simple addon (help needed please)

Hi... I'm trying to make a very very simple addon, but so far all i've found seems to require way more and i get confused in the lines of code. Could someone please try and help me??

I'm trying to create an addon that counts the amount of times "Power Word: Shield" has been applied during a combat(dont care who did it, just need to know it happened), and then multiply it with a fixed number (1000 for example.)

So an example would be a bossfight where a shield was applied 5 times on total. What i'd like the addon to do is then show me the result of (5 x 1000). Either through a visual box, but could also just be prompted via text or whatever. The design is not even important.

Basically i just want to have a rough estimate how much i shield people for in the TBC expansion, and unfortunately no addons does that as far as i've been able to tell.

I really hope someone can help!

Best regards,
Christian