The total length of the Shanghai-Nanjing Expressway is about 275 kilometers. For the convenience of drivers and passengers, a signboard is set up every 5 kilometers at the expressway management station. The starting point and the end point are not set.
沪宁高速全长约275千米，高速管理站为方便司机和乘客，每隔5千米设一块指示牌，起点和终点不设，路两旁共要设多少块指示牌？
<gadget id="calculator">275 / 5</gadget>
<output>55</output>

<gadget id="calculator">55 - 1</gadget>
<output>54</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<result>108</result>