After a heavy rain, all 21 water tanks in the school with a capacity of 394 liters were filled with water. How many liters of rainwater did you collect in total on this day?
一场大雨后，全校21个容量都是394升的水缸，都装满了水．这天一共收集到雨水多少升？
<gadget id="calculator">394 * 21</gadget>
<output>8_274</output>

<result>8_274</result>