known divers can be combined into k teams of different double diving teams. Find the value of k.
已知5位跳水运动员，可以组合成k队不同的双人跳水队伍．求k的值．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>