Question: What is the population of the city where Tom Pepper was born?

full_context: Document 1: MP3: In the second half of '90s, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp, released in 1997. In 1998, the first portable solid state digital audio player MPMan, developed by SaeHan Information Systems which is headquartered in Seoul, South Korea, was released and the Rio PMP300 was sold afterwards in 1998, despite legal suppression efforts by the RIAA.
Document 2: BitTorrent (company): BitTorrent, Inc., (renamed to Rainberry, Inc. in 2017) headquartered in San Francisco, California, is a privately held American company that is responsible for the ongoing development of the BitTorrent peer-to-peer protocol, as well as the ongoing development of µTorrent and BitTorrent Mainline, two clients for that protocol. Files transferred using the BitTorrent protocol constitute a significant slice of all Internet traffic. At its peak, 170 million people used the protocol every month, according to the company’s website. The company was founded on September 22, 2004 by Bram Cohen and Ashwin Navin. In 2018, the company was acquired by cryptocurrency startup TRON, and Bram Cohen left the company.
Document 3: SmoothWall: Released in August 2000, Smoothwall GPL was developed by Lawrence Manning and Richard Morrell to provide a quick and easy - to - use solution to the problem of sharing their ISDN connections with the rest of their LAN. Created using Red Hat Linux, Smoothwall GPL originally had two simple functions: control the modem to dial and hang up, and to route TCP / IP packets from the LAN to the Internet connection, and back again. The LAN was hidden from the public network by NAT, applied using ipchains.
Document 4: Des Moines, Iowa: On September 22, 1851, Des Moines was incorporated as a city; the charter was approved by voters on October 18. In 1857, the name ``Fort Des Moines ''was shortened to`` Des Moines'', and it was designated as the second state capital, previously at Iowa City. Growth was slow during the Civil War period, but the city exploded in size and importance after a railroad link was completed in 1866.
Document 5: Saylorville, Iowa: Saylorville is a census-designated place (CDP) in Polk County, Iowa, United States. The population was 3,301 at the 2010 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area. The Saydel Community School District is located in this area. The unincorporated community of Marquisville is in this area.
Document 6: Tom Truscott: Tom Truscott is an American computer scientist best known for creating Usenet with Jim Ellis, when both were graduate students at Duke University. He is also a member of ACM, IEEE, and Sigma Xi. One of his first endeavors into computers was writing a computer chess program and then later working on a global optimizer for C at Bell Labs. This computer chess program competed in multiple computer chess tournaments such as the Toronto chess tournament in 1977 (2nd place) and the Linz tournament in 1980 (3rd place). Today, Truscott works on tools that analyze software as a software developer for the SAS Institute.
Document 7: Tom Pepper: Tom Pepper (born August 24, 1975 in Des Moines, Iowa) is a computer programmer best known for his collaboration with Justin Frankel on the invention of the Gnutella peer-to-peer system. He and Frankel co-founded Nullsoft, whose most popular program is Winamp, which was sold to AOL in May 1999. Afterwards, Pepper worked inside of AOL as the manager of SHOUTcast, an Internet streaming audio service, and wrote the software along with Stephen "Tag" Loomis and Frankel, before leaving in October, 2004. Pepper then worked on development at RAZZ, Inc. He continues to collaborate with Frankel on independent projects like Ninjam.
Document 8: Tom Hadfield: Tom Hadfield (born 1982 in Wakefield, England) created Soccernet, a sports Internet company, with his father, Greg Hadfield, when he was 12 years old. Soccernet was later sold to ESPN for $40 million when he was 17 years old. Two years later, he and his father were able to raise millions of dollars to launch the education website Schoolsnet.com. Tom Hadfield founded his latest site in 2009, AeroDesigns, Inc after graduating from Harvard University, and now acts as its Chief Executive Officer.
Document 9: MP3: In November 1997, the website mp3.com was offering thousands of MP3s created by independent artists for free. The small size of MP3 files enabled widespread peer-to-peer file sharing of music ripped from CDs, which would have previously been nearly impossible. The first large peer-to-peer filesharing network, Napster, was launched in 1999.
Document 10: Johnston, Iowa: Johnston is a city in Polk County, Iowa, United States. The population was 17,278 in the 2010 census, an increase of almost 100% from the 8,649 population in the 2000 census. It is part of the Des Moines–West Des Moines Metropolitan Statistical Area.
Document 11: Bram Cohen: Bram Cohen (born October 12, 1975) is an American computer programmer, best known as the author of the peer-to-peer (P2P) BitTorrent protocol, as well as the first file sharing program to use the protocol, also known as BitTorrent. He is also the co-founder of CodeCon and organizer of the San Francisco Bay Area P2P-hackers meeting, and was the co-author of Codeville.
Document 12: Des Moines metropolitan area: The Des Moines metropolitan area, officially known as the Des Moines -- West Des Moines, IA Metropolitan Statistical Area (MSA), consists of five counties in central Iowa, United States: Polk, Dallas, Warren, Madison, and Guthrie. The 2010 census population of these counties was 569,633, and the 2017 estimated population was 645,911.
Document 13: Des Moines, Iowa: Age spread: 24.8% under the age of 18, 10.6% from 18 to 24, 31.8% from 25 to 44, 20.4% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 93.8 males. For every 100 females age 18 and over, there were 90.5 males.
Document 14: Middletown, Iowa: Middletown is a city in Des Moines County, Iowa, United States. The population was 318 at the 2010 census. It is part of the Burlington, IA–IL Micropolitan Statistical Area.
Document 15: Cedar Rapids, Iowa: As of the 2010 United States Census, the city population was 126,326. The estimated population of the three - county Metropolitan Statistical Area, which includes the nearby cities of Marion and Hiawatha, was 255,452 in 2008. Cedar Rapids is an economic hub of the state, located in the core of the Interstate 380.
ground_truth: 645,911
sub_queries: Tom Pepper >> place of birth Answer: Des Moines
what is the population of the Des Moines area Answer: 645,911