There are 6 different pictorials and 7 different books on the bookshelf, and you can take at most 2 of them (you have to take them). How many different ways are there?
书架上有6本不同的画报和7本不同的书，从中最多拿2本(不能不拿)，有多少种不同的拿法？
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">13 * 12</gadget>
<output>156</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">156 / 2</gadget>
<output>78</output>

<gadget id="calculator">13 + 78</gadget>
<output>91</output>

<result>91</result>