Question: What was the official capacity of the 1964 Summer Olympics stadium at which the Sanistand appeared?

full_context: Document 1: Toilet seat riser: Toilet seat risers, toilet risers, or raised toilet seats are assistive technology devices to improve the accessibility of toilets to older people or those with disabilities.
Document 2: National Stadium, Karachi: The National Stadium (Urdu: نیشنل اسٹڈیم‎ ) is a cricket stadium in Karachi, Pakistan. It is currently used for cricket matches, it is the home ground of Karachi Kings, Pakistan Super League second expensive team and is home to many other Karachi's domestic cricket teams. The stadium is able to hold 34,228 spectators, Its widely criticised that the city of this size with a population of over 15 million having such a small capacity stadium. In the recent past, PCB has announced on different occasions that the capacity of the stadium will be increased to 90,000 but this approval looks a bit stale at the moment.
Document 3: Olympiastadion (Berlin): Olympiastadion (] ) is a sports stadium in Berlin, Germany. It was originally built for the 1936 Summer Olympics by Werner March. During the Olympics, the record attendance was thought to be over 100,000. Today the stadium is part of the Olympiapark Berlin.
Document 4: Standard Sanitary Mfg. Co. v. United States: Standard Sanitary Mfg. Co. v. United States], also known as the "Bathtub Trust" case, 226 U.S. 20 (1912), was a United States Supreme Court decision in which the Court held unanimously that ownership of patent rights does not immunize the owner from the antitrust laws prohibiting combinations in unreasonable restraint of trade. The Court famously said that the Sherman Act "is its own measure of right and wrong, of what it permits or forbids, and the judgment of the courts cannot be set up against it in a supposed accommodation of its policy with the good intention of parties, and, it may be, of some good results." A 1917 commentary said, "This decision has become the leading case on the subject of the relation of the patent law and Sherman law to each other."
Document 5: Washlet: Washlet (ウォシュレット , Woshuretto ) is a registered trademark of the Japanese toilet company Toto, referring to electric toilet seats with water spray feature for genital and anal cleansing. It falls into the category of "electronic bidets" and is commonplace on toilets in Japan. Released in June 1980, a total of more than 30 million washlets have been sold by January 2011. Washlets have a large share in the cleansing toilet seats market and are so well-known that similar products from other toilet manufacturers like LIXIL (“shower toilet”) are also colloquially referred to as washlets, even though “washlet” is a registered trademark of Toto.
Document 6: National Sports Stadium (Mongolia): National Sports Stadium is a multi-purpose stadium in Ulaanbaatar, Mongolia. It is used mostly for football matches and has a capacity 12,500. The Naadam festival, which celebrates Mongolian independence, is held there every July. The land owned by the stadium company is about 27 hectares, of which the stadium takes about 8 hectares of land. The National Sport Stadium in Mongolia hosted the 2016 World University Archery Championship.
Document 7: Tokyo Dome: Tokyo Dome (東京ドーム , Tōkyō Dōmu ) is a stadium in Bunkyo, Tokyo, Japan. Construction on the stadium began on May 16, 1985, and it opened on March 17, 1988. It was built on the site of the Velodrome, adjacent to the predecessor ballpark, Kōrakuen Stadium. It has a maximum total capacity of 55,000 depending on configuration, with an all-seating configuration of 42,000.
Document 8: Sanistand: Sanistand was a urinal for women manufactured by Japanese toilet maker giant TOTO from 1951 to 1971 and by American Standard from 1950 to 1973. It appeared in a bathroom in the National Stadium for female athletes during the 1964 Summer Olympics in Tokyo. The urinal encouraged women to urinate from a standing position, without the need to sit on a shared seat.
Document 9: Standard Sanitary Manufacturing Company: The Standard Sanitary Manufacturing Company was an American manufacturer of bathroom fixtures. It was formed in 1899 by the merger of the Ahrens and Ott Manufacturing Company, the Standard Manufacturing Company, the Dawes and Myler Manufacturing Company, and 6 other plants which were consolidated to form the Standard Manufacturing Company, headquartered in Pittsburgh, with Theodor Ahrens (Jr.) as its first president. He held this position, and others, until 1934.
Document 10: Pittsburgh toilet: A Pittsburgh toilet, often called a "Pittsburgh potty", is a common fixture in pre-World War II houses built in Pittsburgh, Pennsylvania, United States. It consists of an ordinary flush toilet installed in the basement, with no surrounding walls. As Pittsburgh was historically an industrial town, still called "The Steel City," toilets such as these could be used by steelworkers and miners: grimy from the day's labor, they could use an exterior door to enter the basement directly from outside and use the basement's shower and toilet before heading upstairs. Most of these toilets are paired with a crude basement shower apparatus and large sink, which often doubles as a laundry basin. Also, because western Pennsylvania is a steep topographical zone, many basements have their own entryway, allowing homeowners to enter from their yard or garage, cleanse themselves promptly in their basement, and then ascend their basement stairs refreshed.
Document 11: National Stadium (Tokyo): National Stadium (国立競技場 , Shin kokuritsu kyōgijō ) was a multi-purpose stadium in Kasumigaoka, Shinjuku, Tokyo, Japan. The stadium served as the main stadium for the opening and closing ceremonies, as well as being the venue for track and field events at the 1964 Summer Olympic Games. The Japan national football team's home matches and major football club cup finals were held at the stadium. The stadium's official capacity was 57,363, but the real capacity was only 48,000 seats.
Document 12: Psssssst: Psssssst Instant Spray Shampoo is a no-water substitute for traditional shampoo, popular in the 1970s; its popularity was widespread enough that it is considered a pop culture icon. The Nanny season 1 episode "Maggie the Model" featured a character who modeled for Psssssst during the 1960s. It was produced by Woodridge Labs. Its history may date to the 1950s. The company recently began making Psssssst again. The back label of a recently purchased can reads: "Between Shampoos- On Camping Trips- After Sports When Ill Any time you can't use water. Psssssst is the convenient, quick fresher-upper for your hair."
Document 13: Sarawak State Stadium: State of Sarawak Stadium ("Stadium Negeri" in Malay) is a multi-purpose stadium in Kuching, Sarawak, Malaysia. It is currently used mostly for football matches. The stadium holds 26,000 people and opened in 1989. The stadium hosted Sukma Games in 1990, which Sarawak won. State Stadium is located in an area of 5 hectares in Petra Jaya. Officially opened on August 27, 1983. 3 stages of construction experience. The second stage of construction was completed on June 15, 1989 while the third level with the addition of a block to be completed by June 24, 1991. The total cost of this State Stadium is RM22.6 million. The stadium can accommodate 26,000 spectators at a time. Apart from sport and football, the stadium can also be a venue for organizing the rally events, concerts, performances, meetings, courses, workshops and so on.
Document 14: Addis Ababa National Stadium: Addis Ababa National Stadium will be a multi-purpose stadium, which can host football, rugby and athletics, in Bole, in eastern Addis Ababa, Ethiopia. It will be the national stadium of the Ethiopia national football team. The stadium will have a capacity of 60,000 and will be built by the Chinese State Construction Engineering Corporation. While the stadium itself will cover 37 hectares, development is planned around it, spanning across 60 hectares.
Document 15: National Sports Stadium (Zimbabwe): The National Sports Stadium is a multi-purpose stadium, in Harare, Zimbabwe, with a capacity of 60,000 people. It is used mostly for football matches, but is also used for rugby union. CAPS United F.C. use the venue, which opened in 1987, for most of their home games.
ground_truth: 57,363