Change Question Numbering in Exam Document Class

I am using the exam document class to write my math homework. I want to be able to set the specific number for each question. So, for example, when the professor assigns problems 1, 4, 7, 12, I want to have the following:

1. some text
4. some text
7. some text
12. some text

instead of

1. some text
2. some text
3. some text
4. some text.

Thank you in advance!

setcounter{question}{3} question