When a number is divided by 5, the quotient is 123 and the remainder is 2. What is the number?
一个数除以5，商是123，余数是2，这个数是多少．
<gadget id="calculator">123 * 5</gadget>
<output>615</output>

<gadget id="calculator">615 + 2</gadget>
<output>617</output>

<result>617</result>