Teacher Li has 415 exercise books, among which 196 are distributed to second-grade students and 208 to first-grade students. How many books does Mr. Li have left?
李老师有415本练习本，发给二年级同学196本，一年级同学208本．李老师还剩多少本？
<gadget id="calculator">415 - 196 - 208</gadget>
<output>11</output>

<result>11</result>