rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 south korea 11 1 2 14
how many nations received at least two gold metals ?
WRB JJ NNS VBN IN JJS CD JJ NNS .
3
select count ( c2 ) from w where c3_number >= 2