A farmer who lived in a small village suffered from a severe pain in his chest. This never seemed to get any better. The farmer decided that he would go to see a doctor in the nearest town. But as he was a miserly(吝啬的)person, he thought he would find out that a patient had to pay three pounds for the first visit and one pound for the second visit. The farmer thought about this for a long time, and then he decided to go to the doctor in the town. As he came to the doctor’s consulting room(诊察室), he said "Good morning, doctor. Here I am again." The doctor was a little surprised. He asked him a few questions. Examined his chest and then took the pound which the farmer insisted on giving him. Then the doctor said with a smile, "Well, sir, there is nothing new. Please continue to take the same medicine I gave you the first time you came to see me.\ How many pounds did a patient have to pay the doctor in the town for the two visits