Given that the product of two positive integers is 400, what is the difference between the maximum and minimum values of the sum of these two numbers?
已知两个正整数的乘积是400，则这两个数的和的最大值与最小值的差是多少？
<gadget id="calculator">400 + 1</gadget>
<output>401</output>

<gadget id="calculator">20 - 20</gadget>
<output>0</output>

<gadget id="calculator">401 - 0</gadget>
<output>401</output>

<gadget id="calculator">401 - 40</gadget>
<output>361</output>

<result>361</result>