''' Purpose: Implement module tobe
'''



def series( n ) :
    ''' Returns the value indicated by tobe test problem
    '''

    pass



''' *** YOU SHOULD NOT MODIFY THE BELOW CODE ***  '''

if ( __name__ == '__main__' ) :
    n1, n2, n3, n4 = 0, 1, 4, 9
    ns = [ n1, n2, n3, n4 ]
    for n in ns :
        try :
            r = series( n )
            print( 'series(', n, ') =', r )
        except Exception as e :
            print( e )
        print()