year competition venue position event notes
year
competition
venue
position
event
notes
number
address
number
number hour min sec
number text address rank text time
1990 central american and caribbean games mexico city, mexico 1st 3000 m s'chase 1:00:28 pb
what is the number of marathons that silva ran in the united states ?
WP VBD-AUX DT NN IN NNS WDT NNP VBD IN DT NNP NNPS .
5
select count ( * ) from w where c3_address = 'united states'