The species of fish in the waters of the Yangtze River ranks first in the waters of the country. There are 274 species that can be named, which is about 80 species less than the national freshwater fish species (1/2). How many species of freshwater fish are there in the country?
长江水域中鱼的种类居全国水域之首，能说出名称的有274种，约比全国淡水鱼种的(1/2)少80种．全国淡水鱼约有多少种？
<gadget id="calculator">80 + 274</gadget>
<output>354</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">354 / (1/2)</gadget>
<output>708</output>

<result>708</result>