Question: How many students attend where Andre Dreiding is employed?

Knowledge 1: André Dreiding
André S. Dreiding (22 June 1919 in Zürich – 24 December 2013 in Herrliberg near Zurich) was a Swiss chemist. He finished his high school studies in Zürich and then studied at Columbia University in New York where he was awarded BS and MS degrees. After two years as research assistant at Hoffmann-La Roche, he continued postgraduate studies at University of Michigan in Ann Arbor under professor Werner Emmanuel Bachmann, and was awarded his Ph.D. in 1947. He remained at the university until 1949 as Rackham and Lloyd Postdoctoral Fellow. From 1949 to 1954, Dreiding was assistant professor at Wayne University, Detroit Institute of Cancer Research. He also temporarily took over Bachmann's teaching and research duties at the University of Michigan after Bachmann's death in 1951, and held them until 1952. In 1954, Dreiding turned to Switzerland and University of Zurich, where he became professor, and stayed until his retirement in 1987, after which he has been emeritus professor. [SEP] Knowledge 2: Switzerland
There are 12 universities in Switzerland, ten of which are maintained at cantonal level and usually offer a range of non-technical subjects. The first university in Switzerland was founded in 1460 in Basel (with a faculty of medicine) and has a tradition of chemical and medical research in Switzerland. The biggest university in Switzerland is the University of Zurich with nearly 25,000 students. The two institutes sponsored by the federal government are the ETHZ in Zürich (founded 1855) and the EPFL in Lausanne (founded 1969 as such, formerly an institute associated with the University of Lausanne) which both have an excellent international reputation.[note 10]
Knowledge 1: André Dreiding
André S. Dreiding (22 June 1919 in Zürich – 24 December 2013 in Herrliberg near Zurich) was a Swiss chemist. He finished his high school studies in Zürich and then studied at Columbia University in New York where he was awarded BS and MS degrees. After two years as research assistant at Hoffmann-La Roche, he continued postgraduate studies at University of Michigan in Ann Arbor under professor Werner Emmanuel Bachmann, and was awarded his Ph.D. in 1947. He remained at the university until 1949 as Rackham and Lloyd Postdoctoral Fellow. From 1949 to 1954, Dreiding was assistant professor at Wayne University, Detroit Institute of Cancer Research. He also temporarily took over Bachmann's teaching and research duties at the University of Michigan after Bachmann's death in 1951, and held them until 1952. In 1954, Dreiding turned to Switzerland and University of Zurich, where he became professor, and stayed until his retirement in 1987, after which he has been emeritus professor. [SEP] Knowledge 2: Brigham Young University
The main campus in Provo, Utah, United States sits on approximately 560 acres (2.3 km2) nestled at the base of the Wasatch Mountains and includes 295 buildings. The buildings feature a wide variety of architectural styles, each building being built in the style of its time. The grass, trees, and flower beds on BYU's campus are impeccably maintained. Furthermore, views of the Wasatch Mountains, (including Mount Timpanogos) can be seen from the campus. BYU's Harold B. Lee Library (also known as "HBLL"), which The Princeton Review ranked as the No. 1 "Great College Library" in 2004, has approximately 8½ million items in its collections, contains 98 miles (158 km) of shelving, and can seat 4,600 people. The Spencer W. Kimball Tower, shortened to SWKT and pronounced Swicket by many students, is home to several of the university's departments and programs and is the tallest building in Provo, Utah. Furthermore, BYU's Marriott Center, used as a basketball arena, can seat over 22,000 and is one of the largest on-campus arenas in the nation. Interestingly absent on the campus of this church owned university is a campus chapel. Notwithstanding, each Sunday LDS Church services for students are conducted on campus, but due to the large number of students attending these services, nearly all of the buildings and possible meeting spaces on campus are utilized (in addition, many students attend services off campus in LDS chapels in the surrounding communities).
Knowledge 1: Brigham Young University
The main campus in Provo, Utah, United States sits on approximately 560 acres (2.3 km2) nestled at the base of the Wasatch Mountains and includes 295 buildings. The buildings feature a wide variety of architectural styles, each building being built in the style of its time. The grass, trees, and flower beds on BYU's campus are impeccably maintained. Furthermore, views of the Wasatch Mountains, (including Mount Timpanogos) can be seen from the campus. BYU's Harold B. Lee Library (also known as "HBLL"), which The Princeton Review ranked as the No. 1 "Great College Library" in 2004, has approximately 8½ million items in its collections, contains 98 miles (158 km) of shelving, and can seat 4,600 people. The Spencer W. Kimball Tower, shortened to SWKT and pronounced Swicket by many students, is home to several of the university's departments and programs and is the tallest building in Provo, Utah. Furthermore, BYU's Marriott Center, used as a basketball arena, can seat over 22,000 and is one of the largest on-campus arenas in the nation. Interestingly absent on the campus of this church owned university is a campus chapel. Notwithstanding, each Sunday LDS Church services for students are conducted on campus, but due to the large number of students attending these services, nearly all of the buildings and possible meeting spaces on campus are utilized (in addition, many students attend services off campus in LDS chapels in the surrounding communities). [SEP] Knowledge 2: Brigham Young University
Students attending BYU are required to follow an honor code, which mandates behavior in line with LDS teachings such as academic honesty, adherence to dress and grooming standards, and abstinence from extramarital sex and from the consumption of drugs and alcohol. Many students (88 percent of men, 33 percent of women) either delay enrollment or take a hiatus from their studies to serve as Mormon missionaries. (Men typically serve for two-years, while women serve for 18 months.) An education at BYU is also less expensive than at similar private universities, since "a significant portion" of the cost of operating the university is subsidized by the church's tithing funds.

Answer: nearly 25,000