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import math
# We get an input
radius = int(input())
# Area of the circle in euclidian geometry
area_in_euclidian = math.pi * radius **2
# Area of the circle in taxicab geometry
area_in_taxicab = 2*radius**2
# Adjuct the decimals
print(f'{area_in_euclidian:.6f}')
print(f'{area_in_taxicab:.6f}')