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)