Only 400 people are allowed to enter Huayna Picchu each day. The government website lists how many tickets are available for each day. In the low season it should not be a problem and you should be able to buy your ticket at the last minute. During high season it fills up quickly and you might need to buy your ticket in advance. (http://www.incatrailhikingtours.com/en/travel-info/inca-trail-and-huayna-picchu)
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