What is the sum of all natural numbers less than 100 and relatively prime to 100?
小于100且与100互质的所有自然数的和是多少．
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">100 * 20</gadget>
<output>2_000</output>

<result>2_000</result>