Given the task definition and input, reply with output. In this task, you're given the title of a five-sentence story and the first four sentences. Your job is to write the last sentence of the story to not connect with the rest of the story. Ensure that the generated sentence is contextually relevant to the story.

Title: Milk to cereal ratio. Sentence 1: I have to have a certain amount of milk in my cereal. Sentence 2: If the ratio isn't correct I get mad. Sentence 3: If there is too much milk the cereal is too soggy. Sentence 4: If there isn't enough milk the cereal is too hard.
His grandfather had never studied calculus and could not help him.