; Checks whether at least one pitstop will be done and
; the car gets at least refueled once.
;
; 1. Get the number of pitstop refuels with "pitstopFuel".
;    The amount of fuel actually does not matter.
; 2. The scenario is valid, if at least one time the car
;    gets refueled.

validScenario() <= pitstopFuel(?, ?refuels), ?refuels > 0