100 cups are lined up in a row, numbered from 1 to 100 in sequence, there are 100 students, the first student turns over the cup whose number is divisible by 1, and the second student flips the cup whose number is divisible by 2 Turn over the cups, the third student turns over the cups whose numbers are divisible by 3, ..., the 100th student turns over the cups whose numbers are divisible by 100, then how many cups end up facing up.
100个杯子杯口朝上排成一行，顺次从1到100编号，有100位学生，第一位学生把编号能被1整除的杯子翻一下，第二位学生把编号能被2整除的杯子翻一下，第三位学生把编号能被3整除的杯子翻一下，…，第100位学生把编号能被100整除的杯子翻一下，那么最终有多少个杯子杯口朝上．
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<result>90</result>