There are four consecutive odd numbers whose sum is 216, what is the largest odd number among them.
有四个连续奇数，它们的和是216，其中最大的一个奇数是多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">2 + 4 + 6 + 216</gadget>
<output>228</output>

<gadget id="calculator">1 + 1 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">228 / 4</gadget>
<output>57</output>

<result>57</result>