rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 china 41 27 13 81
how many more more bronze medals did russia earn than china ?
WRB JJ JJR RBR JJ NNS VBD-AUX NNP VB IN NNP .
21
select ( select c5_number from w where c2 = 'russia' ) - ( select c5_number from w where c2 = 'china' )