def compare(weight):
  # Czy cost_of_ground jest najnizsze
  if ( cost_of_ground(weight) < cost_of_drone(weight)  and  cost_of_ground(weight) < cost_of_premium_ground ):

    return cost_of_ground(weight)

  else:

	print("dupa")
    return cost_of_ground(weight)

#print(cost_of_ground(1.5))
#print(cost_of_drone(1.5))
print (compare(50))