50 students participated in the Chinese and Mathematics competitions. There are 25 people who won the mathematics competition, 32 people who won the Chinese competition, 18 people who won the two subjects, and how many people did not win the Chinese and mathematics competitions?
50名同学参加语文和数学学科竞赛．数学竞赛获奖的有25人，语文竞赛获奖的有32人，两科都获奖的有18人，语文、数学竞赛都没获奖的有多少人？
<gadget id="calculator">25 - 18</gadget>
<output>7</output>

<gadget id="calculator">32 - 18</gadget>
<output>14</output>

<gadget id="calculator">7 + 14 + 18</gadget>
<output>39</output>

<gadget id="calculator">50 - 39</gadget>
<output>11</output>

<result>11</result>