Cylinder volume

A cylinder has a height h and a radius r. Your task is to calculate the volume of that cylinder.
As a reminder, the volume of the cylinder is calculated by multiplying the area of the base circle by the height:
notion image
The first 2 lines of the input are two floating-point numbers - the h and the r of the cylinder.
Print its volume in the output.
15 6
Note: You can use math.pi for .


Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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