The distance between the poles of street lamps on the road is 50 meters. After dinner, Mr. Chen went for a walk from the first pole to the tenth pole. How many meters did he walk in total?
马路上路灯的电线杆之间相距50米，陈老师晚饭后去散步从第1根走到第10根电线杆，一共走了多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">50 * 9</gadget>
<output>450</output>

<result>450</result>