item 1 . business cna financial corporation ( continued ) and possible regulatory limitations , impositions and restrictions arising from the emergency economic stabilization act of 2008 . properties : the 333 s . wabash avenue building , located in chicago , illinois and owned by ccc , a wholly owned subsidiary of cna , serves as the home office for cna and its insurance subsidiaries . cna owns or leases office space in various cities throughout the united states and in other countries . the following table sets forth certain information with respect to the principal office buildings owned or leased by cna : location ( square feet ) principal usage 333 s . wabash avenue 803728 principal executive offices of cna chicago , illinois 401 penn street 171318 property and casualty insurance offices reading , pennsylvania 2405 lucien way 121959 property and casualty insurance offices maitland , florida 40 wall street 107927 property and casualty insurance offices new york , new york 1100 ward avenue 104478 property and casualty insurance offices honolulu , hawaii 101 s . phillips avenue 83616 property and casualty insurance offices sioux falls , south dakota 600 n . pearl street 70790 property and casualty insurance offices dallas , texas 675 placentia avenue 63538 property and casualty insurance offices brea , california 1249 s . river road 56100 property and casualty insurance offices cranbury , new jersey 4267 meridian parkway 46903 data center aurora , illinois cna leases its office space described above except for the chicago , illinois building , the reading , pennsylvania building , and the aurora , illinois building , which are owned . diamond offshore drilling , inc . diamond offshore drilling , inc . ( 201cdiamond offshore 201d ) , is engaged , through its subsidiaries , in the business of owning and operating drilling rigs that are used in the drilling of offshore oil and gas wells on a contract basis for companies engaged in exploration and production of hydrocarbons . diamond offshore owns 47 offshore rigs . diamond offshore accounted for 25.9% ( 25.9 % ) , 26.3% ( 26.3 % ) and 18.3% ( 18.3 % ) of our consolidated total revenue for the years ended december 31 , 2009 , 2008 and 2007 . diamond offshore owns and operates 32 semisubmersible rigs , consisting of 13 high specification and 19 intermediate rigs . semisubmersible rigs consist of an upper working and living deck resting on vertical columns connected to lower hull members . such rigs operate in a 201csemi-submerged 201d position , remaining afloat , off bottom , in a position in which the lower hull is approximately 55 feet to 90 feet below the water line and the upper deck protrudes well above the surface . semisubmersible rigs are typically anchored in position and remain stable for drilling in the semi-submerged floating position due in part to their wave transparency characteristics at the water line . semisubmersible rigs can also be held in position through the use of a computer controlled thruster ( 201cdynamic-positioning 201d ) system to maintain the rig 2019s position over a drillsite . five semisubmersible rigs in diamond offshore 2019s fleet have this capability . diamond offshore 2019s high specification semisubmersible rigs are generally capable of working in water depths of 4000 feet or greater or in harsh environments and have other advanced features , as compared to intermediate semisubmersible rigs . as of january 25 , 2010 , seven of the 13 high specification semisubmersible rigs , including the recently acquired ocean courage , were located in the u.s . gulf of mexico ( 201cgom 201d ) . at that date diamond offshore had two high specification semisubmersible rigs operating offshore brazil , while a third was en route to brazil from the gom . of .

Table:
location | size ( square feet ) | principal usage
333 s . wabash avenue chicago illinois | 803728 | principal executive offices of cna
401 penn street reading pennsylvania | 171318 | property and casualty insurance offices
2405 lucien way maitland florida | 121959 | property and casualty insurance offices
40 wall street new york new york | 107927 | property and casualty insurance offices
1100 ward avenue honolulu hawaii | 104478 | property and casualty insurance offices
101 s . phillips avenue sioux falls south dakota | 83616 | property and casualty insurance offices
600 n . pearl street dallas texas | 70790 | property and casualty insurance offices
675 placentia avenue brea california | 63538 | property and casualty insurance offices
1249 s . river road cranbury new jersey | 56100 | property and casualty insurance offices
4267 meridian parkway aurora illinois | 46903 | data center
item 1 .
business cna financial corporation ( continued ) and possible regulatory limitations , impositions and restrictions arising from the emergency economic stabilization act of 2008 .
properties : the 333 s .
wabash avenue building , located in chicago , illinois and owned by ccc , a wholly owned subsidiary of cna , serves as the home office for cna and its insurance subsidiaries .
cna owns or leases office space in various cities throughout the united states and in other countries .
the following table sets forth certain information with respect to the principal office buildings owned or leased by cna : location ( square feet ) principal usage 333 s .
wabash avenue 803728 principal executive offices of cna chicago , illinois 401 penn street 171318 property and casualty insurance offices reading , pennsylvania 2405 lucien way 121959 property and casualty insurance offices maitland , florida 40 wall street 107927 property and casualty insurance offices new york , new york 1100 ward avenue 104478 property and casualty insurance offices honolulu , hawaii 101 s .
phillips avenue 83616 property and casualty insurance offices sioux falls , south dakota 600 n .
pearl street 70790 property and casualty insurance offices dallas , texas 675 placentia avenue 63538 property and casualty insurance offices brea , california 1249 s .
river road 56100 property and casualty insurance offices cranbury , new jersey 4267 meridian parkway 46903 data center aurora , illinois cna leases its office space described above except for the chicago , illinois building , the reading , pennsylvania building , and the aurora , illinois building , which are owned .
diamond offshore drilling , inc .
diamond offshore drilling , inc .
( 201cdiamond offshore 201d ) , is engaged , through its subsidiaries , in the business of owning and operating drilling rigs that are used in the drilling of offshore oil and gas wells on a contract basis for companies engaged in exploration and production of hydrocarbons .
diamond offshore owns 47 offshore rigs .
diamond offshore accounted for 25.9% ( 25.9 % ) , 26.3% ( 26.3 % ) and 18.3% ( 18.3 % ) of our consolidated total revenue for the years ended december 31 , 2009 , 2008 and 2007 .
diamond offshore owns and operates 32 semisubmersible rigs , consisting of 13 high specification and 19 intermediate rigs .
semisubmersible rigs consist of an upper working and living deck resting on vertical columns connected to lower hull members .
such rigs operate in a 201csemi-submerged 201d position , remaining afloat , off bottom , in a position in which the lower hull is approximately 55 feet to 90 feet below the water line and the upper deck protrudes well above the surface .
semisubmersible rigs are typically anchored in position and remain stable for drilling in the semi-submerged floating position due in part to their wave transparency characteristics at the water line .
semisubmersible rigs can also be held in position through the use of a computer controlled thruster ( 201cdynamic-positioning 201d ) system to maintain the rig 2019s position over a drillsite .
five semisubmersible rigs in diamond offshore 2019s fleet have this capability .
diamond offshore 2019s high specification semisubmersible rigs are generally capable of working in water depths of 4000 feet or greater or in harsh environments and have other advanced features , as compared to intermediate semisubmersible rigs .
as of january 25 , 2010 , seven of the 13 high specification semisubmersible rigs , including the recently acquired ocean courage , were located in the u.s .
gulf of mexico ( 201cgom 201d ) .
at that date diamond offshore had two high specification semisubmersible rigs operating offshore brazil , while a third was en route to brazil from the gom .
of .

Question: what is diamond offshore's total rig count?
Answer: 79
Calculation: add(47, 32)