There are 10 2s and 10 5s, how many values can be formed with these.
有10个2和10个5，用这些可以构成的数值有多少种．
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

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

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">50 + 16</gadget>
<output>66</output>

<result>66</result>