The fifth grade students subscribed 360 copies of "We Love Science", which is 60 copies less than three times that of the fourth grade students. How many copies of "We Love Science" were subscribed by the two grades?
五年级同学订阅《我们爱科学》360份，比四年级同学订阅份数的3倍少60份，两个年级一共订阅《我们爱科学》多少份？
<gadget id="calculator">360 + 60</gadget>
<output>420</output>

<gadget id="calculator">420 / 3</gadget>
<output>140</output>

<gadget id="calculator">140 + 360</gadget>
<output>500</output>

<result>500</result>