A cylindrical can, the height is 6.28 cm, and its lateral expansion is a square. How much iron sheet is needed to make 1000 such cans?
一个圆柱形的罐头，高是6.28厘米，它的侧面展开是一个正方形．做1000个这样的罐头至少需要多少铁皮？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 * 6.28</gadget>
<output>39.4384</output>

<gadget id="calculator">6.28 + 39.4384</gadget>
<output>45.7184</output>

<gadget id="calculator">45.7184 * 1_000</gadget>
<output>45_718.4</output>

<result>45_718.4</result>