There are 1989 students sitting in a row, numbered from left to right: 1, 2, 3...1989, the first time the teacher asked students with even numbers to stand up, and then the rest of the students numbered from left to right Number: 1, 2... The second time the teacher asked the students with even numbers to stand up. Repeat this 5 times, how many students are standing.
有1989位同学坐成一排，从左至右依次编上号：1、2、3…1989，第一次老师让编号是双数的同学站起来，然后余下的同学再从左至右编上号：1、2…第二次老师又让编号是双数的同学站起来．如此重复做了5次有多少名同学站着．
<gadget id="calculator">1_989 - 1</gadget>
<output>1_988</output>

<gadget id="calculator">1_988 / 2</gadget>
<output>994</output>

<gadget id="calculator">995 - 1</gadget>
<output>994</output>

<gadget id="calculator">994 / 2</gadget>
<output>497</output>

<gadget id="calculator">498 / 2</gadget>
<output>249</output>

<gadget id="calculator">249 - 1</gadget>
<output>248</output>

<gadget id="calculator">248 / 2</gadget>
<output>124</output>

<gadget id="calculator">124 / 2</gadget>
<output>62</output>

<gadget id="calculator">994 + 497 + 249 + 124 + 62</gadget>
<output>1_926</output>

<result>1_926</result>