#P28. 【例7.2】与圆相关的计算

【例7.2】与圆相关的计算

Description

Given the radius of a circle, find its diameter, circumference, and area.
If the radius of the circle is rr, then the diameter, circumference, and area are 2×r2 \times r, 2×π×r2 \times π \times r, and π×r×rπ \times r \times r respectively, where π=3.14159π=3.14159.

Input Format

Input consists of a single real number rr (0<r100000 < r \le 10000), representing the radius of the circle.

Output Format

Output a single line containing three numbers, representing the diameter, circumference, and area of the circle, separated by a space, each with 44 decimal places.

Sample

3.0
6.0000 18.8495 28.2743