A bottle of beverage is 1 liter in total, just fill a large cup and 3 small cups, a large cup can hold 400 ml of drink, and a small cup can hold how many milliliters of drink.
一瓶饮料共一升，正好倒满一只大杯和3只小杯，一只大杯可盛饮料有400毫升，一只小杯可盛饮料多少毫升．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<gadget id="calculator">600 / 3</gadget>
<output>200</output>

<result>200</result>