rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 united states 12 13 6 31
how many more silver medals did russian win than denmark ?
WRB JJ JJR NN NNS VBD-AUX JJ VBP IN NNP .
4
select ( select c4_number from w where c2 = 'russia' ) - ( select c4_number from w where c2 = 'denmark' )