Under the surprised or suspicious gazes of the students, Lin En stood on the podium, used his hand as a pen and pure magic power as ink to write his name in the void.

Then the quiet classroom immediately became noisy.

"Professor Lin En, I heard that you came from the other side of the Sea of ​​Mist. Can you tell us what it is like outside?"

"Professor Philip said that you think this continent is spherical, so why don't the people below fall off?"

…

Perhaps it was because Lin En looked too young, about the same age as them, so the wizard apprentices were not as reserved as they were when facing the other professors, and kept asking all kinds of questions.

For example, how he crossed the foggy sea and defeated the whirlpool, what kind of magic he used to destroy half of the port city, and even mentioned his free fall experiment.

Apparently, his deeds had spread in just a day and a half. The wizard apprentices who came to attend the class were not looking forward to the course but were simply extremely curious about this new professor from beyond the Sea of ​​Mists.

Faced with this series of questions, Lynn didn't know which one to answer first. At this moment, Johnny, who was sitting next to him, suddenly asked.

"Professor Lin, what is Mathematical Olympiad?"

Lynn breathed a sigh of relief, then began to explain.

"Good question. Mathematical Olympiad is a discipline that studies complex concepts such as quantity, structure, change, and space. You can use it to measure the circumference of the planet under your feet, explore the laws of the movement of stars, and analyze cosmological constants... Mathematical Olympiad covers almost everything you see. It is the most important tool for gaining insight into the truth and understanding the world!"

As he spoke, Lin En used the principle of sound wave transmission to increase his volume, making everyone's eardrums buzz and successfully making the originally noisy classroom quiet again.

Every apprentice present couldn't help but feel fascinated when listening to those extremely high-sounding terms coming out of Lin En's mouth, and many of them realized that they were taking a very special magic course.

However, Lin En, who had finished drawing the pie, changed the subject and continued to speak. "Of course, these advanced Olympiad mathematics knowledge is still too far away from you. Now you must start with the simplest addition, subtraction, multiplication and division..."

"Isn't that just counting?" The apprentice sitting in the front row couldn't help but interrupt. "We've already learned all this in the basic class."

The prerequisites for learning magic are literacy and understanding the most basic principles of calculation, so Yieta Academy usually provides children born in poor families with a period of basic knowledge cram school, teaching them how to read, count, and recognize basic magic symbols.

"After learning multiplication and division, can we master some powerful magic?" another wizard apprentice asked curiously.

"No." Lynn shook her head.

Seeing his denial, the students' faces suddenly became disappointed. Some even suspected that Lin En was just trying to trick them into taking this course by talking about Olympiad mathematics in such a miraculous way.

"Then isn't this Olympiad Mathematics class the same as the basic class? Mathematics isn't that difficult. It only took me over a month to master it all..." A freckled boy who looked about fifteen years old asked proudly.

"Oh? Really? Are you sure?" Lin En asked with a smile, and then clapped his hands, attracting everyone's attention.

Although he could release [Magic-Barrage] to show these people the powerful combination of magic and Olympiad mathematics, Lin En knew that if he wanted to continue the Olympiad mathematics class, he had to let these people know that even pure mathematics still had unimaginable power! "In that case, let's make a bet!" Lin En smiled slightly, stretched out his hand and snapped his fingers. Under the effect of [Mage's Hand], the four desks in front of him floated up, and then spliced ​​into a larger square table.

Then the feather pen placed on the desk automatically dipped in ink and divided the large square table into six rows horizontally and vertically, for a total of thirty-six squares.

"The rules are very simple. Place a copper coin in the first square, two in the second square, four in the third, eight in the fourth, and so on..." Lynn looked around at every apprentice in the classroom and spoke in a very seductive tone.

"If someone can fill these squares with the corresponding coins, I will immediately write an application to the Wizard Council to explain that he has completed the study of the arcane mathematics with full marks, and give him a bottle of [Source of Magic]..."

"Professor, is this true? Are you kidding me?" Another tall and thin apprentice, Pierce, who was in his twenties, stood up suddenly and asked excitedly.

What is the [Source of Magic Power]? It is the most important thing for a wizard apprentice to be promoted to a formal wizard. It is worth hundreds... or even hundreds of magic gold coins, and it is not something that can be bought with money! For a poor student like him who is in his twenties and has not yet completed any subject, Lin En's two promises are particularly important.

"Of course, I guarantee it with my personality!" Lin En nodded and said without hesitation.

After hearing Lin En's decisive words, Pierce hesitated for a moment. His life experience told him that there could be no such cheap thing in the world. Either the professor in front of him was fooling him, or there was something wrong here.

Peirce did a rough calculation in his head, but soon he could no longer calculate. He could only roughly estimate that it would take sixty-three copper coins to fill the first six boxes in the first row, which did not seem like a lot.

"Does anyone want to try? There is only one spot!" Lin En said temptingly again.

"I'll do it!" The freckled boy who had interrupted him stood up impatiently.

When Pierce saw Alok standing up, he immediately felt regretful. He should not have hesitated and did not even have the courage to fight. No wonder he could not be promoted to an official wizard.

"What's your name?" Lynn asked curiously.

"I am Alok, Professor!" the wizard said loudly.

So your name is Alok...

Lin En nodded. Yesterday, he just happened to accept a favor from the other party's father, asking him to take care of the boy.

Isn't this opportunity here?

"Elok, right? I must remind you first that you cannot give up this bet. Now that you have played it, you must fill up the entire square, and the money you put up will be used as research funds for this subject. This is the price you pay in exchange for my promise and the [Source of Magic]!" Lin En kindly reminded.

"Of course no problem!" Alok said, patting his chest. Although he couldn't calculate how many copper coins were needed to fill these squares, he was very clear about the value of a copper coin and a bottle of [Source of Magic].

This is a gap of millions of times!

Millions of copper coins would be enough to fill up these thirty-six squares. No, perhaps only twenty or thirty thousand copper coins would be enough.

"Then please come in!" Lynn pointed at the square table and put on a signature smile on his face, indicating that Alok could start his performance.

Alok was not at all nervous. He took out his purse and placed the first copper coin on the first square.

Then came two, four, eight, sixteen... thirty-two...

By the time he placed the coins on the sixth square, he had run out of coins. The seventh square required sixty-four coins...

Elok held a silver coin in his hand, hesitated for a while, and did not put it down directly. Instead, he turned his head to look at the students who were watching the show, and said very proudly, "Can anyone lend me some copper coins? When I fill this square, I will return it double tomorrow!"

Encouraged by Alok, the wizard apprentices present generously took out their own purses, not worrying that the other party would not be able to pay it back. Pierce, who was still regretting, even took out all his savings - six gold coins! Soon the borrowed coins filled the entire table, and only Johnny watched on the side without any intention of taking the money.

"Johnny, aren't you going to make some money?" Lin En asked curiously. "Or have you already figured out the result?"

The silver-gray-haired girl rolled her eyes at him. Although she couldn't calculate how many copper coins were needed to fill the thirty-six squares, she knew that there was definitely nothing wrong with Lin En's brain, and he couldn't take out a bottle of [Source of Magic Power].

Alok on the side seemed full of confidence. With the funds of all the apprentices put together, there were more than twenty gold coins and more than two hundred copper and silver coins. No matter what, they would be able to fill in all the squares!

Thinking of this, Alok grabbed a handful of coins and filled in the second row of squares.

After spending a total of forty silver and ninety-five copper coins, one-third of the square table's grid had been filled.

Easy, so easy.

Most of the apprentices were already regretting why they hadn't been the first to step forward. Even Johnny, who had great confidence in Lin, began to waver. Could this square table really be filled? Alok was even more excited, and he piled forty silver coins and ninety-six copper coins into the thirteenth square. However, when he continued to fill it, he vaguely sensed something was wrong, because the last square in the third row needed to hold thirteen gold coins!

This is probably... seems... seems... is it a bit too much? Alok's expression became hesitant, and he didn't have enough money to fill in the next square.

“You can just write down the amount with a pen, and we’ll calculate it together when the time comes!” Lin En reminded him indifferently, with no intention of making things difficult for him.

Alok looked at the half remaining square, gritted his teeth, picked up the feather pen beside him, and began to fill in the lines one by one.

Two hundred... no... three hundred... As long as the total amount he spends is less than three hundred magic gold coins, his father should be able to forgive him. After all, the [Source of Magic] cannot be bought with money.

However, with this idea in mind, after filling in four squares, Alok discovered that his budget had been used up and he had to pay a lot more.

Under Lynn's "kind" gaze, Alok's hands were shaking as he wrote the numbers. The numbers were so huge that he had to use paper and pen to assist in the calculations starting from the third line.

But Alok would rather not be able to figure it out. His heart tightened with every number he wrote down. When he wrote the fifth line, he was about to cry.

Alok had already silently calculated the family's assets in his mind, and then he discovered something that horrified him.

They seem to be bankrupt...

No, this is no longer a problem that can be solved by bankruptcy.

Because to fill the last row of the fifth row, a full 53,687 magic gold coins were needed! Alok's mind went blank, and he fainted. Even if he became a formal wizard in the future, he would not be able to earn so much money even if he worked non-stop for hundreds of years! And there was still a whole row on the square table that was not filled! "Alok...Alok!"

Everyone present was shocked when Alok suddenly fell to the ground, including Lin En. He didn't want to scare anyone to death during his first class.

After using his limited medical knowledge to check, Lin En quickly found that the other person was not seriously injured. He immediately made an ice cube and pressed it on the man's forehead, which soon woke the man up.

Alok looked dazed. He seemed to have just had a dream. He dreamed that he played a game with the professor and then owed him a debt that he could never repay in his lifetime...

When he opened his eyes, he discovered a fact he didn't want to face - this didn't seem to be a dream, but reality...

"Now that you're awake, fill in the last square as agreed!" Lynn patted Alok's shoulder and said encouragingly.

Alok's face was covered with an expression uglier than crying, but he had to sit in his seat. In the end, he could only give up completely and comfort himself in his heart that he couldn't afford 50,000 magic gold coins, so what difference would it make even if he increased it to 200,000 or 500,000?

There really is a difference! The long string of numbers made Alok's brain collapse.

After filling in the last square, Alok had to count the units one by one with his fingers.

Ones, tens, hundreds, thousands, tens of thousands, hundreds of thousands, millions, tens of millions, hundreds of millions... Alok couldn't bear to count any more, so Lin En revealed the answer directly.

"It's 34,359,738,368 copper coins!"

Hearing this terrifying number, the students present felt dizzy and looked at the square long table in front of them. It was hard to imagine that 33.3 billion copper coins could be accommodated in this small square!

Johnny also showed an expression of disbelief on her face. Although she could imagine that it would take a lot of copper coins to fill the squares, she never expected it to be so terrifying.

Let alone Alok, I'm afraid that even if the entire Yieta Harbor was sold, it would still be impossible to raise the money! A mere grid game instantly made all the wizard apprentices realize the horror of exponential growth! Lin En looked at the silent students who were still immersed in the huge numbers and spoke solemnly.

"This is the power of Olympiad mathematics! If someone could transform the power of Olympiad mathematics into magic, it would be a force powerful enough to destroy this planet and even the entire universe!"

This is no joke! If you fold a piece of paper in half 103 times, its theoretical thickness will exceed the diameter of the observable universe.

Anything that can keep growing exponentially by 2 will soon burst the entire universe! (PS: Happy Mid-Autumn Festival to everyone. I will post two chapters today... I will ask for anything for the new book!) (End of this chapter)