□/8=7…★, the maximum number in □ can be filled.
□/8=7…★，□里的数最大可以填多少．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">56 + 7</gadget>
<output>63</output>

<result>63</result>