The school bought 2,500 sheets of blank paper, 435 sheets were used in March, and 565 sheets were used in April. How many sheets are left?
学校买来2500张白纸，三月份用去435张，四月份用去565张，还剩下多少张？
<gadget id="calculator">2_500 - 435 - 565</gadget>
<output>1_500</output>

<result>1_500</result>