what was the total number of centers selected in the first round?
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col : round | pick | player | pos. | nationality | team | aba team | signing price row 1 : 1 | 1 | artis gilmore^ | c | united states | chicago bulls | kentucky colonels | $ 1,100,000 row 2 : 1 | 2 | maurice lucas* | f/c | united states | portland trail blazers (from atlanta) | kentucky colonels | $ 300,000 row 3 : 1 | 3 | ron boone | g/f | united states | kansas city kings | spirits of st. louis | $ 250,000 row 4 : 1 | 4 | marvin barnes | f/c | united states | detroit pistons | spirits of st. louis | $ 500,000 row 5 : 1 | 5 | moses malone^ | f/c | united states | portland trail blazers | spirits of st. louis | $ 350,000 row 6 : 1 | 6 | randy denton | c | united states | new york knicks | spirits of st. louis | $ 50,000 row 7 : 1 | 7 | bird averitt | g | united states | buffalo braves (from milwaukee) | kentucky colonels | $ 125,000 row 8 : 1 | 8 | wil jones | f | united states | indiana pacers | kentucky colonels | $ 50,000 row 9 : 1 | 9 | ron thomas# | g/f | united states | houston rockets | kentucky colonels | $ 15,000 row 10 : 1 | 10 | louie dampier | g | united states | san antonio spurs | kentucky colonels | $ 20,000 row 11 : 1 | 11 | jan van breda kolff | g/f | united states | new york nets | kentucky colonels | $ 60,000 row 12 : 2 | 12 | mike barr | g | united states | kansas city kings | spirits of st. louis | $ 15,000
what was the total number of centers selected in the first round?
Round Pick Player Pos. Nationality Team ABA team Signing price
1 1 Artis Gilmore^ C United States Chicago Bulls Kentucky Colonels $ 1,100,000
1 2 Maurice Lucas* F/C United States Portland Trail Blazers (from Atlanta) Kentucky Colonels $ 300,000
1 3 Ron Boone G/F United States Kansas City Kings Spirits of St. Louis $ 250,000
1 4 Marvin Barnes F/C United States Detroit Pistons Spirits of St. Louis $ 500,000
1 5 Moses Malone^ F/C United States Portland Trail Blazers Spirits of St. Louis $ 350,000
1 6 Randy Denton C United States New York Knicks Spirits of St. Louis $ 50,000
1 7 Bird Averitt G United States Buffalo Braves (from Milwaukee) Kentucky Colonels $ 125,000
1 8 Wil Jones F United States Indiana Pacers Kentucky Colonels $ 50,000
1 9 Ron Thomas# G/F United States Houston Rockets Kentucky Colonels $ 15,000
1 10 Louie Dampier G United States San Antonio Spurs Kentucky Colonels $ 20,000
1 11 Jan van Breda Kolff G/F United States New York Nets Kentucky Colonels $ 60,000
2 12 Mike Barr G United States Kansas City Kings Spirits of St. Louis $ 15,000
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