In the formula □/4=□…□, the quotient and the remainder are the same, what is the largest dividend
算式□/4=□…□中，商和余数相同，被除数最大是多少
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<result>15</result>