rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 puerto rico 17 27 13 57
how many countries earned only one gold medal ?
WRB JJ NNS VBD RB CD NN NN .
4
Keyword Keyword Keyword Column Keyword Keyword Keyword Keyword Column Keyword Literal.Number
select count ( c2 ) from w where c3_number = 1
Keyword Keyword Column None None Literal Column None None
['agg', 'agg_count'] ['agg', 'agg_count'] c2 c3_number