Teacher: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
Solution: Researchers did experiments on kids in order to find out _ .
Reason: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Now, solve this instance: Article: The Elysee Palace in France enjoys equal popularity in the world with the Buckingham Palace in the United Kingdom, the Kremlin in Russia as well as the White House in the U. S. It is the residence of the president of the French Republic and the symbol of the supreme authority in France. The Elysee palace, with an area of 11,000 square metres, is at the eastern end of the Champs Elysee in the city of Paris proper and backed by a large and peaceful garden of more than twenty thousand square metres. Its main building, quite handsome and graceful, is a two-story classical stone architecture of European style, and beside it are two side buildings facing each other and with an extensive rectangular courtyard in the middle. There are altogether 369 halls and rooms of different sizes. The Elysee Palace, built in 1718, has a ling history of close to300 years to date. This house was at first a private residence of a count named d'Evreau, so it was called Hotel d'Evreau. It had later gone through many changes and its owners had been changed for many times, but all the residents in it were distinguished persons and high officials. The house was renamed Bonaparte Mansion when it was owned by Louis X V and Louis X VI successively when they acted as emperors. Napoleon I signed his act of abdication here when he had suffered defeat in the Battle of Waterloo in 1815. Nopoleon III moved in the Mansion in 1848 when he was elected president, and the house became a Royal Palace when he declared himself as emperor. The Third French Republic issued a decree in 1873, appointing officially the Elysee Palace as the residence president of the French Republic. Over the hundred years since then, almost all the president of the French Republic worked and lived there. Starting from 1989, the Elysee Palace is open to the public every year in September on the French Castles Day.
Answer: 3
Student:
The number of the buildings of the Elysee Palace is _ .