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 the united states win compared to russia ?
WRB JJ JJR NN NNS VBD-AUX DT NNP NNPS VB VBN TO NNP .
8
select ( select c4_number from w where c2 = 'united states' ) - ( select c4_number from w where c2 = 'russia' )