Divide 16 balls into 4 piles with different numbers, and the pile with the largest number has at most how many balls.
把16个球分成数量不同的4堆，数量最多的一堆最多有多少个个球．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">16 - 6</gadget>
<output>10</output>

<result>10</result>