rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 russia 3 0 2 5
how many countries did not earn silver medals ?
WRB JJ NNS VBD-AUX RB VB JJ NNS .
3
select count ( c2 ) from w where c4_number = 0