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 vietnam (vie) 3 0 3 6
how many gold medals where won in total ?
WRB JJ JJ NNS WRB VBN IN NN .
9
select sum ( c3_number ) from w