In order to apply for the Guangzhou Olympiad School, Xiaoying began to use her spare time every day to do exercises in the "Primary School Mathematical Olympiad Course" since New Year's Day in 2004. We know that there are 13 practice questions and self-test questions in a certain lecture. If she completes at least 3 questions every day, then what is the total number of different practice methods she plans to complete 13 questions.
小莹为报考广州市奥校，从2004年元旦开始，每天利用课余时间做《小学数学奥林匹克初级教程》中的练习题．我们知道某一讲的练习题和自测题共13题，如果每天至少完成3道题，那么她计划完成13题不同的练习方法总数是多少．
<gadget id="calculator">4 + 3 + 6 + 3 + 3 + 2 + 2 + 2 + 2 + 1</gadget>
<output>28</output>

<result>28</result>