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 7 6 1 14
how many teams won at least three bronze medals in this event ?
WRB JJ NNS VBD IN JJS CD NN NNS IN DT NN .
4
select count ( c2 ) from w where c5_number >= 3