There are plenty of images that stump the internet — remember the blue-vs.-white-dress debacle — but sometimes these puzzles are a little more straightforward and just require some good old math skills.

Some of these viral problems seem quite obvious, and it can be perplexing how others can’t figure it out, but some brain teasers do take the web by storm, leaving people scratching their heads and unable to agree upon the correct answer.

One such puzzle recently made the rounds, and when this math problem first went viral on social media, only 1 in 1,000 people could figure it out.

Do you think you can beat the odds and be one of the few who can solve the problem yourself? Check out the puzzle that’s stumping the internet below.

You’ll have to solve it a little differently than you might think, but once you understand the pattern, it all makes sense.

Sometimes, things are simpler than they actually look, but you should be impressed if you figured it out yourself the first time around!