There are 5 medium envelopes in a large envelope, and 6 small envelopes in each medium envelope. How many envelopes are there in total?
一个大信封里面放着5个中等的信封，每个中等的信封里又放6个小信封，一共有多少个信封．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">1 + 5 + 30</gadget>
<output>36</output>

<result>36</result>