There are 4 pencils of different colors and 3 ballpoint pens of different colors in a pencil case. If you take any pen from the pencil case, how many different ways can you hold it?
一个铅笔盒里有4支不同颜色的铅笔和3支不同颜色的圆珠笔，从铅笔盒里任意拿一支笔，有多少种不同的拿法．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>