Katerina: "Xie Kefu and I have decided to focus on Question 89. Want to join us?"
Song He: "No, I've decided to do Question 50. Want to join me?"
Katerina: "Are you crazy?"
Song He: "I'm not crazy!"
"Being able to solve one of the final questions would already be impressive. You're actually planning to do Question 50? That's completely unrealistic, okay?"
"Yesterday, you were still saying you weren't capable of solving problems, and today you're suddenly challenging the impossible. What's wrong with you?"
Song He: "Please help me out. I'm in desperate need of backup!"
Katerina: "I can't help! If you solve one of the final questions, you might still finish before the forum ends. But solving a mid-range question is completely hopeless! I advise you to wake up too. This isn't ordinary homework—it's the Problem Wall of the International Mathematics Forum!"
Song He sighed and put down his phone.
Great. I'm completely on my own now!
Looks like I'll have to tackle this problem myself!
He pulled open the drawer of his computer desk, took out several large sheets of white paper, and spread them across the desktop.
Then he opened the calculator on his computer and left it on standby.
Finally, he reread the question and the Incomplete Answer provided by the Wishing Well, and got to work!
Song He took a deep breath and quickly entered the zone. Like a soldier left alone to guard a position, the lines of his face gradually hardened, and his eyes filled with a willingness to face death!
There was no hope of reinforcements anymore. He could only fight this battle alone.
After a long period of thought, his hand moved. The pen tip touched the paper as he tried to write out the solution:
"M is wrapped inside a