600
A U . S . intelligence official , speaking on condition of anonymity , said Barzan Ibrahim had been a presidential adviser to Saddam ' s regime since 1998 , but had a shaky relationship with his half brother and was not part of the regime ' s inner circle .
 ( start position: been,  Barzan Ibrahim: person, regime: entity) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( start position: been,  Barzan Ibrahim: person, regime: entity) 