For a circular fountain with a radius of 16 meters, build a ring-shaped flower belt with a width of 1 meter around it, such as planting 32 flowers per square meter, and each flower is 4.5 yuan. How much is the minimum investment for this ring-shaped flower belt ?
一个半径为16米的圆形喷水池，在它的周围修一条宽为1米的环形花带，如每平方米植花32株，每株花4.5元，这条环形花带至少要投资多少元？
<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<gadget id="calculator">17 ** 2</gadget>
<output>289</output>

<gadget id="calculator">16 ** 2</gadget>
<output>256</output>

<gadget id="calculator">289 - 256</gadget>
<output>33</output>

<gadget id="calculator">32 * 4.5</gadget>
<output>144</output>

<gadget id="calculator">3.14 * 33 * 144</gadget>
<output>14_921.28</output>

<result>14_921.28</result>