A cuboid water tank has a length of 5 decimeters, a width of 4 decimeters, a depth of 3 decimeters, and a horizontal height 4 centimeters from the mouth of the tank. If a cube with a side length of 2.1 decimeters is placed, how many liters of water will overflow in the tank?
一个长方体水箱，长5分米，宽4分米，深3分米，水平高度离水箱口4厘米．如果放一块棱长为2.1分米的正方体石块，这时水箱内会溢出多少升水？
<gadget id="calculator">2.1 * 2.1 * 2.1</gadget>
<output>9.261</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 - (2/5)</gadget>
<output>13/5 = around 2.6</output>

<gadget id="calculator">5 * 4 * (13/5)</gadget>
<output>52</output>

<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<gadget id="calculator">52 - 60</gadget>
<output>-8</output>

<gadget id="calculator">9.261 + (-8)</gadget>
<output>1.261</output>

<result>1.261</result>