There are 5 different magic books on the first floor of the bookshelf in the Hogwarts library. Now Harry Potter is going to add two different new books. How many different ways are there?
霍格沃茨图书室书架第一层上放着5本不同的魔法书，现在哈利波特要加入两本不同的新书，有多少不同的放法．
<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">15 * 2</gadget>
<output>30</output>

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

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">30 + 12</gadget>
<output>42</output>

<result>42</result>