"""
Aufgabe 77
(c) Jürgen Meier
www.3d-meier.de
09.03.2026
"""

import math



n = 15   # Endwert Laufvariable
s = 0    # Summe



for k in range(1, n+1):
    a = k**2 + k - 1.0
    b = k + 2
    # Fakultät berechnen
    f = 1
    for i in range(1, b+1):
        f = f*i  
    s = s + a/f    
    print(s)

c = n + 2
# Fakultät berechnen
f = 1
for i in range(1, c+1):
    f = f*i  
       
print("-------------------")
print(0.5 - (n+1.0)/f)