"""
Aufgabe 43
(c) Jürgen Meier
www.3d-meier.de
25.12.2025
"""

import math


k = 30      # Endwert Laufvariable
s = 0.0     # Summe

for k in range(1, k+1):
    a = (1.0/3)**(k-1)
    s = s + k*a    
    print(s)

print("---------------------")
print(9.0/4)