Li Dong sells a CD, half of which were sold before lunch, 15 discs during lunch, 45 discs after lunch, and 8 discs left. How many discs were there in total?
李东卖一种光盘，午饭前卖了一半，午饭间卖了15盘，午饭后卖了45盘，还剩8盘，原来一共有多少盘？
<gadget id="calculator">15 + 45 + 8</gadget>
<output>68</output>

<gadget id="calculator">68 * 2</gadget>
<output>136</output>

<result>136</result>