Definition: In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Input: Statement: Now he had to think of the simplest possible similarity computer. Choices:  1. He was compelled to think of a simple similarity computer. 2. He had a satisfactory similarity computer and felt no urgency. 3. A simple computer that could understand similarity seemed inconceivable to him.

2