A kind of pesticide is prepared by mixing liquid medicine and water at a ratio of 1:1500. There are 3 kilograms of liquid medicine. How many kilograms of this pesticide can be prepared?
一种农药，用药液和水按1：1500配制而成，现有3千克药液，能配制这种农药多少千克？
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">1_500 * 3</gadget>
<output>4_500</output>

<gadget id="calculator">4_500 + 3</gadget>
<output>4_503</output>

<result>4_503</result>