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 ):
    # print ("Najnizsza cena to cost_of_ground" )
    return cost_of_ground(weight)
  #elif (cost_of_drone)
  #else:


    return cost_of_ground(weight)


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