IF Formula Leaving As-Is

Hey guys, just a quick question about the IF Formula:

I'm still new so bare with me.

What code do I write to make the formula leave the current information "As-is" in the cell?

For example: Say I had a cell with a number in it. I run that IF formula to check if it is a specific number or not. If it is, it changes it. If it isn't, it keeps the existing number in the cell the same.

What do I write at the end of the IF formula to keep it unchanged?

Any suggestions would be extremely helpful.

Thanks,
Pete

Ah thats perfect, thanks!

Is there any generic code I can insert instead of a specific cell (A1)??

I think I figured out my own mess of a question. Hehe thanks for the help!