To celebrate "July 1st", Class 4 (1) is going to decorate the classroom. They want to hang a lantern every 1 meter on both sides of the classroom (both ends should also be hung), and the monitor measures the length of the classroom to be 8 meters. How many lanterns do they need to buy in total?
为庆祝"七•一"，四(一)班同学准备把教室装扮一下．他们要在教室的两边每隔1米挂一个灯笼(两端也要挂)，班长量出教室长8米．他们共需买几个灯笼？
<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>