Xiaodong went to buy a pen. He liked 4 types of pencils, 3 types of ballpoint pens, and 5 types of painting brushes, but he could only buy one of them with the money he brought. How many different choices did he have?
小东去买笔，他喜欢的有4种装铅笔，3种圆珠笔，5种画画笔，但他带的钱只能买其中的1支，他有多少种不同的选择．
<gadget id="calculator">4 + 3 + 5</gadget>
<output>12</output>

<result>12</result>