The number 569 was repeated in her head as she thanked the clerk and headed for the elevator.  Pushing the button, the doors opened immediately and she stepped in, pushing the 5th floor.  Before long, they re-opened onto a long hallways going going straight ahead and one off to the left.  Walking straight ahead, she came to the first door, "Hmm, number 560."  Slowly she walked down to the nineth door and knocked.