According to statistics in 2013, the forests on the earth are decreasing at an average rate of 180,000 square kilometers per year, and will disappear completely in 160 years. What is the forest area on the earth in 2013?
2013年统计，地球上的森林以平均每年18万平方千米速度减少，160年后将全部消失，2013地球上的森林面积是多少平方千米．
<gadget id="calculator">18 * 160</gadget>
<output>2_880</output>

<result>2_880</result>