rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 brazil 13 18 12 43
which countries won the least amount of medals ?
WDT NNS VBD DT JJS NN IN NNS .
Peru|Paraguay
select c2 from w where c6_number = ( select min ( c6_number ) from w )