radius = int(input()) / 2
pi = 3.14
volume = 1.33 * pi * (radius ** 3)
print(f"{volume:.2f}")

SELECT lastName  ' '  firstName AS Name
FROM employees
WHERE officeCode != (
    SELECT officeCode
    FROM offices
    WHERE city = 'San Francisco'
)
ORDER BY Name ASC;

# Read input
P = int(input())
R = int(input())
T = int(input())

# Calculate Simple Interest
SI = (P * R * T) / 100

# Output
print("{:.2f}".format(SI))