The school carried out tree planting activities. A total of 526 trees were planted, including 378 trees in the fifth and sixth grades. How many trees were planted in other grades?
学校开展植树活动，一共植了526棵，其中五、六年级植了378棵，其他年级植树多少棵？
<gadget id="calculator">526 - 378</gadget>
<output>148</output>

<result>148</result>