Pie Are Squared

#4N_RedWings1
Limits 1s, 512 MB

Given the radius of a circle, calculate and print its area.

The area of a circle can be computed using the following formula:

A=πr2A = \pi r^2

For pi, you can use 3.141592653589793, or acos(-1).

Input

The input will contain one floating-point number rr (0<r<20000 < r < 2000).

Output

Print the area of the circle (accurate to 10410^{-4}).

Sample

InputOutput
2
12.5663706144

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Statistics

94% Solution Ratio
farzeen_nazEarliest, Nov '18
farzeen_nazFastest, 0.0s
t5577.Lightest, 0 B
x20x20Shortest, 22B
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