A man wanted to enter an exclusive suit but did not have the required password. He waited by the door and listened. A club member knocked on the door and the doorman said, "twelve". The man replied ,"six" and was let in. A second member came to the door and the doorman said ,"six". The man replied,"three" and was let in. The man thought he had heard enough and walked up to the door. The doorman said,"ten" and the man replied,"five". But was not let in.What do you think the man should have said?