rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
first second
number
number
number
number
number text(text) number number number number
1 united states (usa) 5 0 0 5
how many teams got at least 5 medals ?
WRB JJ NNS VBD IN JJS CD NNS .
3
select count ( c2 ) from w where c6_number >= 5