There is a flower bed with a height of 0.5 meters and a square bottom with a side length of 2.3 meters. The surroundings are made of bricks, the thickness is 0.3 meters, and the middle is filled with soil. How many cubic meters of soil are there in the flower bed?
有一个花坛，高0.5米，底面是边长2.3米的正方形．四周用砖砌成，厚度是0.3米，中间填满泥土，花坛里大约有多少立方米泥土？
<gadget id="calculator">0.3 * 2</gadget>
<output>0.6</output>

<gadget id="calculator">2.3 - 0.6</gadget>
<output>1.7</output>

<gadget id="calculator">1.7 * 1.7 * 0.5</gadget>
<output>1.445</output>

<result>1.445</result>