There is a cone-shaped pile of sand in a cement factory. The circumference of the bottom surface is 62.8 meters, the height is 5 meters, and the weight of sand per cubic meter is 1.5 tons. What is the mass of this pile of sand?
水泥厂有一堆圆锥形沙子，底面周长62.8米，高5米，每立方米沙子重1.5吨，这堆沙子的质量是多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">(1/3) * 3.14 * 100 * 5 * 1.5</gadget>
<output>785</output>

<result>785</result>