import math
from decimal import Decimal, getcontext

# Set a high precision to handle large exponents accurately
getcontext().prec = 1000

n = int(input())

sum_p = Decimal(0)
for k in range(0, 7):
    comb = math.comb(6, k)
    sign = (-1) ** k
    term = Decimal(comb) * Decimal(sign) * (Decimal(6 - k) / Decimal(6)) ** n
    sum_p += term

# Format the output to print up to 12 decimal places, trailing zeros may be omitted
print("{0:.12f}".format(sum_p))