Fangfang and Dandan go to a movie. They sit in the same row with 30 seats. How many different ways can Fangfang and Dandan sit together?
芳芳和丹丹去看电影，她们坐在同一排有30个座位，芳芳和丹丹坐一起有多少种不同的坐法．
<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">29 * 2</gadget>
<output>58</output>

<result>58</result>