A kind of clock strikes once at 1 o'clock, twice at 2 o'clock, ..., twelve times at 12 o'clock, only once at half o'clock. How many knocks were made all day and night.
一种时钟1点敲一下，2点敲二下，…，12点敲十二下，每次半点都只敲一下．一昼夜一共敲了多少下．
<gadget id="calculator">1 + 12</gadget>
<output>13</output>

<gadget id="calculator">13 * 12</gadget>
<output>156</output>

<gadget id="calculator">156 / 2</gadget>
<output>78</output>

<gadget id="calculator">2 * 78</gadget>
<output>156</output>

<gadget id="calculator">156 + 24</gadget>
<output>180</output>

<result>180</result>