A handful of coins are full of 2 cents and 5 cents. This coin has a total of 1 yuan. Ask how many different situations there may be.
一把硬币全是2分和5分的，这把硬币一共有1元，问这里可能有多少种不同的情况．
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

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

<result>9</result>