rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 france 28 28 24 80
how many counties have at least one silver medal ?
WRB JJ NNS VBD-AUX IN JJS CD NN NN .
18
select count ( c1 ) from w where c4_number >= 1