In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Ex Input:
Question: Indinavir is a selective inhibitor of HIV protease because: 
 Options:  <1> By hydrolysis, the active drug is generated. <2> Rents irreversibly the active center of the enzyme. <3> Its structure mimics the transition state of the reaction catalyzed by the enzyme. <4> It is a suicide inhibitor. <5> Its symmetric structure interacts effectively with the active center of the enzyme.

Ex Output:
3


Ex Input:
Question: The Arrhenius equation: 
 Options:  <1> It relates the speed of a chemical reaction with the so-called constant velocity and with the concentrations of the reactants raised to their stoichiometric coefficients. <2> It relates the constant of speed of a chemical reaction with the energy of activation of said reaction, so that if the energy, of activation is high the reaction is fast. <3> It is only fulfilled for unimolecular reactions. <4> It relates the speed constant to the temperature through the activation energy and the pre-exponential factor. <5> It allows to obtain the activation energy of an elementary reaction by only representing the decimal logarithm of the temperature versus the inverse of the reaction time.

Ex Output:
4


Ex Input:
Question: The change corresponds to a change mutation: 
 Options:  <1> T → C. <2> A → T. <3> G → A. <4> C → T. <5> A → G.

Ex Output:

2