How many centimeters are needed to tie a gift box with a length of 30cm, a width of 12cm and a height of 12cm with ribbons? (Ribbon knot length 15cm)
用彩带捆扎长30cm，宽12cm，高12cm的礼品盒，需要多少厘米？(彩带结长15cm)
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">60 + 24 + 48 + 15</gadget>
<output>147</output>

<result>147</result>