A job can be done in 3 ways, 5 people will use the first method to complete it, 4 people will use the second method to complete it, and 6 people will use the third method to complete it. How many ways are there to choose a person to do the job?
一件工作可以用3种方法完成，有5人会用第1种方法完成，有4人会用第2种方法完成，有6人会用第3种方法完成．选出一个人来完成这项工作共有多少种选法？
<gadget id="calculator">5 + 4 + 6</gadget>
<output>15</output>

<result>15</result>