Among the paintings exhibited in the "June 1st" art exhibition, 14 are not from the sixth grade, 17 are not from the fifth grade, and there are 21 paintings from the fifth and sixth grades. So, how many paintings are exhibited by other grades?
"六一"画展所参展的画中，14幅不是六年级的，17幅不是五年级的，而五、六年级共展画21幅．那么，其他年级参展的画是多少幅．
<gadget id="calculator">14 + 17</gadget>
<output>31</output>

<gadget id="calculator">31 - 21</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>