Yuying Primary School held a student art exhibition. Among them, 17 are not in the fifth grade, and 18 are not in the fourth grade. Now that there are 19 paintings exhibited in grades 4 and 5, how many paintings are exhibited in other grades?
育英小学举行学生画展．其中17幅不是五年级的，18幅不是四年级的．现在知道四、五年级共展出19幅画，那么其他年级共展出多少幅画？
<gadget id="calculator">18 - 19</gadget>
<output>-1</output>

<gadget id="calculator">17 + (-1)</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>