function failsafe()
  turtle.select(1)
  if not turtle.compareTo(1) then
        print("Brak sadzonek")
        print("Nacisnij jakikolwiek przycisk by wylaczyc komputer...")
        os.pullEvent("key")
        stop()
  end
  turtle.select(2)
  if not turtle.compareTo(2) then
        print("Brak maczki kostnej")
        print("Nacisnij jakikolwiek przycisk by wylaczyc komputer...")
        os.pullEvent("key")
        stop()
  end
  turtle.select(3)
  if not turtle.compareTo(3) then
        print("Brak paliwa")
        print("Nacisnij jakikolwiek przycisk by wylaczyc komputer...")
        os.pullEvent("key")
        stop()
  end
end
function stop()
  os.shutdown()
end
function chop()
  turtle.dig()
  turtle.digUp()
  turtle.up()
end
Bonemealcount = 20

while true do
  failsafe()
  while turtle.getFuelLevel() <= 20 do
        turtle.select(3)
        turtle.refuel(1)
  end
  turtle.select(1)
  turtle.place()
  turtle.select(2)
  for i = 1, Bonemealcount do
        turtle.place()
  end
  while turtle.detect() do
        chop()
  end
  while not turtle.detectDown() do
        turtle.down()
  end
end