>>> from serie import serie

>>> serie(0.7, 1.2, 0.01)
8
>>> serie(0.7, 1.2, 0.001)
11
>>> serie(0.7, 1.204, 0.001)
14
>>> serie(0.8, 1.6094, 0.01)
14
>>> serie(0.8, 1.6094, 0.001)
23
>>> serie(0.8, 1.6094, 0.0001)
31
>>> serie(0.8, 1.6094, 0.00001)
35