One day, a consultant was encountered on the road on a minced sheep. The counselor proposed to play a gamble with the shepherd, guess the number of sheep in the past. If you guess, the shepherd will send a sheep. If not, pay the shepherd a hundred gold coins. The shepherd is pleased to promise. The consultant took out the notebook, and the satellite in the space, the number of only the sheep was detected through the satellite, and the results were very accurate. The shepherd's heart is orally, please ask the teacher to pick one hug. So the counselor chose a sheep from the flock. At this time, the Shepherd proposed to play a gamble with the counselor, gumped, guess the identity of the consultant, the bet is still a sheep, the counselor is also pleased. As a result, the shepherd relieves the identity of the consultant and the consultant is very surprised. The explanation of the shepherd is as follows: 1. You are a person I don't invite the two. I know three. You never return it to four. You are not a sheep, but my shepherd.