from cmath import pi

END_CONDITION = (pi**2)/6
sum = 0
i = 1
counter = 0

while(True):
    sum = sum + (1/(i**2))
    if('%.6f'%sum == '%.6f'%END_CONDITION):
        print('%.6f'%sum)
        break
    i = i+1
    counter = counter +1

print('Anzahl der Iterationen: ', counter)