rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 nigeria 13 5 6 24
the total number of medals won by south africa was how many ?
DT JJ NN IN NNS VBN IN NNP NNP VBD-AUX WRB JJ .
30
select c6_number from w where c2 = 'south africa'