Slacker co-workers

Hello dear forumers, hope you're all doing well. So I'm doing a little three-month summer job to keep myself occupied and earn some money... but it's turned out to be a real pain for me... I have two co-workers (doing the same job as me) who are constantly slackering... they'd rather spend their time socializing than working... it's gotten to the point where I've been doing their job so we don't get any negative remarks from the supervisors and the department can keep functioning... but lately I feel totally worn out and I am not able to put up with the mess... I typically have a nice character and get along with almost all of them pretty well (I limit the interactions to the office) but I've had enough of their slackering and have decided to adress the issue to the boss... do you think I'm right to do so? How should I handle the issue?

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