□/7=6…☆, the maximum number of filling in □
□/7=6…☆，□里最大填多少
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">42 + 6</gadget>
<output>48</output>

<result>48</result>