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Do you want to win free pizza for 3.14 years? We’re going to assume the answer to that question is yes, because free pizza for 3.14 days would even be amazing. The free pizza can be yours—all you have to do is answer three math questions.

National Pi Day is March 14, because the numbers 3/14 correspond to 3.14, which are the first three digits of the constant pi. So on March 14, Pizza Hut will be kicking off the contest at 8 a.m. ET by putting the math questions online Because Pizza pi(e).

If you’re a math wiz, this may sound like it’s right up your alley—but there’s a catch. The questions aren’t so simple. They were created by Princeton mathematics professor John H. Conway and range in difficulty from high school level to PhD level. So you really have to earn your free pizza.

There will be three winners, one for each question — but that’s assuming all the problems actually get solved. A spokesperson for Pizza Hut said that even the pizza chain doesn’t know the answers to the questions. It’s a “closely guarded secret” held by Conway, who will be the person checking over the answers.

“Pi may be irrational, but free pizza is anything but,” Conway, an award winning mathematician, said in a statement. “I’m eager to challenge America with these problems and find the next great pizza-loving mathematician that can solve them.”

National Pi Day is only a few days away, so time is running out to brush up on your math skills.

Pizza Hut estimates that 3.14 years of free pizza prize is worth around $1,600. That’s a lot of pizza—enough to make us wish we payed more attention in math class.