How many four-digit numbers are there in which the sum of the numbers above is 34?
各位上的数字和是34的四位数一共有多少个．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>