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: yeah yeah i don't know we haven't bought Choices:  1. We should have purchased.   2. I know that we did not purchase.   3. I am sure that we purchased.  

3