What is the sum of all three-digit numbers whose sum is 16?
数字和为16的所有三位数之和是多少．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 + 3</gadget>
<output>21</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">6 + 18 + 21 + 15 + 6</gadget>
<output>66</output>

<result>66</result>