A division formula, the quotient and remainder are both 28, what is the smallest divisor
一道除法算式，商和余数都是28，被除数最小是多少
<gadget id="calculator">28 + 1</gadget>
<output>29</output>

<gadget id="calculator">28 * 29</gadget>
<output>812</output>

<gadget id="calculator">812 + 28</gadget>
<output>840</output>

<result>840</result>