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))

def solve(n, a):
    o_i = [i for i, x in enumerate(a) if x == 1]

    if len(o_i) <= 1:
        return 1

    w = 1
    for i in range(1, len(o_i)):
        z_b_o = o_i[i] - o_i[i - 1] - 1
        w *= (z_b_o + 1)

    return w