If two natural numbers are divided, the quotient is 16, the remainder is 13, and the sum of the dividend, divisor, quotient and remainder is 569, what is the dividend?
如果两个自然数相除，商是16，余数是13，被除数、除数、商与余数的和是569，那么被除数是多少．
<gadget id="calculator">16 * 31</gadget>
<output>496</output>

<gadget id="calculator">496 + 13</gadget>
<output>509</output>

<result>509</result>