The original cargo in the warehouse is 80 tons, and 80 tons is recorded as 0 tons, then the warehouse's four purchases are +6 tons, -4 tons, -12 tons and +8 tons. How many tons are there in the warehouse at this time?
仓库原有货物80吨，把80吨记为0吨，则后来仓库四次的进货情况是+6吨、-4吨、-12吨和+8吨．这时仓库有货物多少吨？
<gadget id="calculator">80 * 5</gadget>
<output>400</output>

<gadget id="calculator">6 - 4 - 12</gadget>
<output>-10</output>

<gadget id="calculator">(-10) + 8</gadget>
<output>-2</output>

<gadget id="calculator">400 + (-2)</gadget>
<output>398</output>

<result>398</result>