Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: I couldn't understand what the teacher was talking about. Sentence 2: She was done with the problem already. Sentence 3: I sat there in frustration trying to figure it out. Sentence 4: She asked everyone to get their calculators. Sentence 5: I was so angry that I refused to get mine.

Calculator