One day, Teacher Yang went to a convenience store to buy lunch. The convenience store served 3 different meat dishes and 5 different vegetarian dishes that day. Teacher Yang planned to buy 2 dishes to eat together, but there was at least one meat dish. So, how many different collocations are there for Mr. Yang's lunch?
某天，杨老师去便利店买午饭，便利店当天供应3种不同的荤菜和5种不同的素菜，杨老师打算买2种菜搭配吃，但至少有一种荤菜．那么，杨老师的午饭共有多少种不同的搭配方式．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<result>18</result>