There is a 1020-meter-long path from the park to the small island in the middle of the lake. On both sides of the path, a peach tree is planted every 15 meters from the beginning to the end. How many peach trees need to be planted in total?
从公园同往湖心的小岛有一条长1020米的小路，在这条小路的两侧，从头到尾每隔15米栽一棵桃树，一共需要栽多少棵桃树．
<gadget id="calculator">1_020 / 15</gadget>
<output>68</output>

<gadget id="calculator">68 + 1</gadget>
<output>69</output>

<gadget id="calculator">69 * 2</gadget>
<output>138</output>

<result>138</result>