Among the 10 numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9, how many numbers are equal to itself when multiplied by itself and divided by itself?
在0、1、2、3、4、5、6、7、8、9这10个数中，乘自己和除自己都与它本身相等的数字有多少个个．
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<result>1</result>