How many different divisors are there in 72?
72有多少个不同的约数．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>