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The bigger question is: Will it run on my operating system?
You should download the trial of Photoshop Elements and see if that will work for you.
Adobe no longer sells the CS series, and with all the counterfeits out there, you're liable to get cheated or infected with malware.
You can go with Elements or many other alternative photo-editing software.
Peru Bob is very much correct... even if you are able to acquire CS1, I'd be surprised if you have an OS that still runs it. See if Photoshop Elements suits your needs and desires
Depending on what you're doing and if you own any mobile devices, you might also look into some of Adobe's Mobile Apps. Many are available. Here is a good starting point: Adobe mobile apps for iPhone, iPad, Android | Adobe Creative Cloud