My code for ADC button handling, it works, but can it be slimmed down?

[Ioannis]

if !flag then
    adcin 1, adcval   'read keys
    SELECT CASE adcval
      CASE < 10 : left=left+1:flag=1 'detect button presses
      CASE < 100
    @ NOP
      CASE < 130 : right=right+1 :flag=1'detect button presses
    END SELECT
endif

Something like that then?

Ioannis