A total of 8 trees are planted at both ends of one side of the boulevard. The distance between two adjacent trees is 5 meters. What is the length of the boulevard?
林荫道的一侧两端共栽了8棵树，相邻两棵树间隔5米，林荫道长多少米．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>