The draw at the theater. - Liceo Scientifico R. Bruni (Padova)

Every year, in a certain country, the local theater company organizes a raffle in which a yearly subscription is given to a person sitting in the audience. The raffle is conducted by having all the people stand up and then sit down alternately; several rounds are done until only one person is left standing. Can we predict who the winner will be, knowing the number of people present in the theater?