american tower corporation and subsidiaries notes to consolidated financial statements 2014 ( continued ) maturities 2014as of december 31 , 2007 , aggregate carrying value of long-term debt , including capital leases , for the next five years and thereafter are estimated to be ( in thousands ) : year ending december 31 .

$ 1817: 2009: 1241
2010: 78828
2011: 13714
2012: 1894998
thereafter: 2292895
total cash obligations: 4283493
accreted value of the discount and premium of 3.00% ( 3.00 % ) notes and 7.125% ( 7.125 % ) notes: 1791
balance as of december 31 2007: 4285284

4 . acquisitions during the years ended december 31 , 2007 , 2006 and 2005 , the company used cash to acquire a total of ( i ) 293 towers and the assets of a structural analysis firm for approximately $ 44.0 million in cash ( ii ) 84 towers and 6 in-building distributed antenna systems for approximately $ 14.3 million and ( iii ) 30 towers for approximately $ 6.0 million in cash , respectively . the tower asset acquisitions were primarily in mexico and brazil under ongoing agreements . during the year ended december 31 , 2005 , the company also completed its merger with spectrasite , inc . pursuant to which the company acquired approximately 7800 towers and 100 in-building distributed antenna systems . under the terms of the merger agreement , in august 2005 , spectrasite , inc . merged with a wholly- owned subsidiary of the company , and each share of spectrasite , inc . common stock converted into the right to receive 3.575 shares of the company 2019s class a common stock . the company issued approximately 169.5 million shares of its class a common stock and reserved for issuance approximately 9.9 million and 6.8 million of class a common stock pursuant to spectrasite , inc . options and warrants , respectively , assumed in the merger . the final allocation of the $ 3.1 billion purchase price is summarized in the company 2019s annual report on form 10-k for the year ended december 31 , 2006 . the acquisitions consummated by the company during 2007 , 2006 and 2005 , have been accounted for under the purchase method of accounting in accordance with sfas no . 141 201cbusiness combinations 201d ( sfas no . 141 ) . the purchase prices have been allocated to the net assets acquired and the liabilities assumed based on their estimated fair values at the date of acquisition . the company primarily acquired its tower assets from third parties in one of two types of transactions : the purchase of a business or the purchase of assets . the structure of each transaction affects the way the company allocates purchase price within the consolidated financial statements . in the case of tower assets acquired through the purchase of a business , such as the company 2019s merger with spectrasite , inc. , the company allocates the purchase price to the assets acquired and liabilities assumed at their estimated fair values as of the date of acquisition . the excess of the purchase price paid by the company over the estimated fair value of net assets acquired has been recorded as goodwill . in the case of an asset purchase , the company first allocates the purchase price to property and equipment for the appraised value of the towers and to identifiable intangible assets ( primarily acquired customer base ) . the company then records any remaining purchase price within intangible assets as a 201cnetwork location intangible . 201d .

Questions:
what was the total cost of the towers acquired in the year of 2005?
and what was the number of towers bought?
what was, then, the average cost per tower?
and what was that number of towers bought counting this year and the next?
including 2007, what becomes this number for the three years?

Answers:
6000000
30
200000
377
407