On National Day, the school plans to place chrysanthemums evenly on the four sides of the square garden, and place chrysanthemums on the four corners, that is, the vertices, and place 50 pots on each side. How many pots of chrysanthemums do you need to prepare?
国庆节学校准备在正方形花园的四条边上均匀摆放菊花，四个角即顶点上都摆放，每条边上摆放50盆．共需要准备多少盆菊花．
<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<gadget id="calculator">200 - 4</gadget>
<output>196</output>

<result>196</result>