When a number is divided by 4, the quotient is 126 with a remainder of 1. What is the number?
一个数除以4，商是126余1，这个数是多少．
<gadget id="calculator">126 * 4</gadget>
<output>504</output>

<gadget id="calculator">504 + 1</gadget>
<output>505</output>

<result>505</result>