the number of victims has to be the same for all teams during one scoring run. The amount of victims will not change, otherwise the scoring the teams are achieving during one run is not comparable.
So theoretically you know the amount of victims before the run starts, but according to
3.4.4 Teams are not allowed to give their robot any advance information about the field. A robot is supposed to recognize the field elements by itself
You are not allowed to pass this or any other advanced information to the robot. The robot needs to be able to solve the whole task autonomously.