When a number is divided by 16, the quotient is 20, and there is a remainder. When the remainder is the largest, what is the dividend.
一个数除以16，商是20，有余数，当余数最大时，被除数是多少．
<gadget id="calculator">16 * 20</gadget>
<output>320</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">320 + 15</gadget>
<output>335</output>

<result>335</result>