Cut some pine trees equidistantly around a rectangular lawn with a length of 345 meters and a width of 240 meters. It is required to plant exactly one pine tree at the four vertices and the midpoint of each side, so how many pine saplings should be purchased at least.
在一个长345米、宽240米的长方形草坪四周等距离地裁一些松树，要求四个顶点和每边中点都正好栽一棵松树，则最少要买松树苗多少棵．
<gadget id="calculator">345 * 10</gadget>
<output>3_450</output>

<gadget id="calculator">240 * 10</gadget>
<output>2_400</output>

<gadget id="calculator">3_450 + 2_400</gadget>
<output>5_850</output>

<gadget id="calculator">2 / 75</gadget>
<output>2/75 = around 0.026667</output>

<gadget id="calculator">5_850 * (2/75)</gadget>
<output>156</output>

<result>156</result>