"""
Aufgabe 42
(c) Jürgen Meier
www.3d-meier.de
25.12.2025
"""

import math


k = 40      # Endwert Laufvariable
s = 0.0     # Summe

for k in range(1, k+1):
    a = k*2**k
    s = s + 1.0/a    
    print(s)

print("---------------------")
print(math.log(2))