You will be given a definition of a task first, then some input of the task.
In this task, you're given a statement and three sentences as choices. Your job is to determine which sentence can be inferred from the statement. Incorrect choices change the meaning in important ways or have details that are not mentioned in the statement. Indicate your answer as 1,2, or 3 corresponding to the choice number of the selected sentence.

Statement: The exponent of Pb in Equation (1), then, is not a traditional elasticity; rather, it is an elasticity for changes in own-price when the discount remains unchanged, referred to in this paper as a no-shift elasticity. Choices:  1. The exponent of Pb in the first equation is not a traditional elasticity.  2. The subscript of Pb in the first equation refers to traditional elasticity. 3. The elasticity refers to stretchiness in rubber bands.
Output:
1