2019-11-15: init

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2019-11-15 03:29:24 +09:00
commit 9780f1b736
32 changed files with 633 additions and 0 deletions

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"""
"""
import math
r = int(input())
print("%.6f"%round(r**2*math.pi,6))
print("%.6f"%round(2*r**2,6))