In order to improve the safety of participants and the quality of the evidence , the Organization decided to limit entries to the following vacancies : Ultra Trilhos dos Abutres 50Km : 600 athletes , and some places are reserved for foreigners, official partners , totalistic and members of ATRP ( Trail Running Association of Portugal ) Trilhos dos Abutres 27km : 500 athletes , and some places are reserved for foreigners, totalistic and the rest assigned by lot   There will be also 100 dorsal solidarity in which the value reverts to the House of