□/7=15…△, the maximum number that can be filled in □.
□/7=15…△，□中最大可填多少．
<gadget id="calculator">7 * 15</gadget>
<output>105</output>

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">105 + 6</gadget>
<output>111</output>

<result>111</result>