□□/□=15…3, when the divisor is the smallest, how much to fill in □.
□□/□=15…3，当除数最小时，□里填多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 + 3</gadget>
<output>63</output>

<result>63</result>