rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 japan 18 8 8 34
how many nations have received at least 1 gold medal ?
WRB JJ NNS VBD-AUX VBN IN JJS CD NN NN .
9
select count ( c2 ) from w where c3_number >= 1