Scientific research shows that the ratio of the distance from the top of the head to the navel (ie the height of the upper body) to the distance from the navel to the bottom of the feet (ie the height of the lower body) of an adult is the most beautiful when it is 0.618. The height of an adult woman is 1.58 meters, and the height of her upper body is 61.8 centimeters. She needs to look best in shoes with a heel height of what height.
科学研究表明：成人的头顶到肚脐的距离(即上身高度)与肚脐到脚底的距离(即下身高度)的比的比值是0.618时最美．一位成年女子的身高是1.58米，上身高度为61.8厘米．她需要穿上鞋跟高度为多少的鞋看起来最美．
<gadget id="calculator">0.618 * 61.8</gadget>
<output>38.1924</output>

<gadget id="calculator">0.618 * 1.58 * 100</gadget>
<output>97.644</output>

<gadget id="calculator">38.1924 - 97.644</gadget>
<output>-59.4516</output>

<gadget id="calculator">61.8 + (-59.4516)</gadget>
<output>2.3484</output>

<gadget id="calculator">2.3484 / 0.618</gadget>
<output>3.8</output>

<result>3.8</result>