It rained for 29 days in a certain place in the first half of last year, and the number of sunny days was three times that of rainy days. How many fewer days are there rainy days than sunny days?
某地去年上半年下了29天雨，晴天是雨天的3倍．雨天比晴天少多少天？
<gadget id="calculator">29 * 3</gadget>
<output>87</output>

<gadget id="calculator">87 - 29</gadget>
<output>58</output>

<result>58</result>