pos no driver constructor laps time/retired grid points
pos
no
driver
constructor
laps
time\\/retired
grid
points
number
number
number
number hour min sec
number
number
rank number text text number time number number
1 5 jim clark lotus-ford 80 1:59:25.6 1 9
what is the number of drivers who did n't finish the race due to engine trouble ?
WP VBD-AUX DT NN IN NNS WP VBD-AUX RB VB DT NN JJ TO NN NN .
6
select count ( c3 ) from w where c6 = 'engine'