Teacher Liu goes to the gym 3 times a week, but in order to prevent excessive exercise, he cannot go to the gym for two consecutive days. How many schedules does Teacher Liu have that meet the conditions?
刘老师在一个星期中要去3次健身馆，但是为了防止运动过量，不能连续两天都去，刘老师一共有多少种满足条件的时间安排？
<gadget id="calculator">7 * 6 * 5</gadget>
<output>210</output>

<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<gadget id="calculator">210 / 6</gadget>
<output>35</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">35 - 15</gadget>
<output>20</output>

<result>20</result>