On one side of a tree-lined avenue, a telephone pole is erected every 15 meters from the beginning to the end, and there are 86 telephone poles in total. How many meters is the total length of this tree-lined avenue?
在一条绿荫大道的一侧从头到尾每隔15米竖一根电线杆，共用电线杆86根，这条绿荫大道全长多少米？
<gadget id="calculator">86 - 1</gadget>
<output>85</output>

<gadget id="calculator">85 * 15</gadget>
<output>1_275</output>

<result>1_275</result>