:type seriesLenght: int
        :rtype: int

def bestExponent(self, seriesLenght):
        '''
        :type seriesLenght: int
        :rtype: int
        '''
        i = 0
        cont = True
        while(cont):
            if(int(seriesLenght/int(math.pow(2, i))) <= 1):
                cont = False
            else:
                i += 1
        return int(i-1)