There are 1542 fruit trees in the orchard, including 147 pear trees, 684 peach trees, and the rest are all apple trees. How many apple trees are there?
果园里共有1542棵果树，其中梨树有147棵，桃树有684棵，其余的全部是苹果树．苹果树有多少棵？
<gadget id="calculator">1_542 - 147 - 684</gadget>
<output>711</output>

<result>711</result>