You will be given a definition of a task first, then some input of the task.
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'.

Question: According to the recommendations of the 2010 Guide of the Spanish Council of Cardiopulmonary Resuscitation, when applying cardiopulmonary resuscitation maneuvers in an infant, the following should be done:
Options: <1> Perform cardiac massage with both hands. <2> Achieve that the thorax descend between 5 and 8 cm in each compression. <3> Blow out as much air as possible when performing mouth-to-mouth ventilation. <4> Maintain a cardiac massage frequency around 200 beats per minute. <5> Use a 15: 2 compression and ventilation ratio.
Output:
5