Among all three-digit numbers, how many three-digit numbers satisfy the sum of their digits to be equal to 12?
在所有的三位数中，满足其数字和等于12的三位数共有多少个．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 - 2</gadget>
<output>14</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">6 * 7</gadget>
<output>42</output>

<gadget id="calculator">14 + 10 + 42</gadget>
<output>66</output>

<result>66</result>