What was the maximum l&cr number for archimedes?
{'header': ['L&CR No.', 'Type', 'Manufacturer', 'Delivered', 'Name', 'Jt. Cttee No.', '1845 disposal'], 'page_title': 'London and Croydon Railway', 'section_title': 'Summary table', 'caption': 'Summary table', 'rows': [['1', '2-2-2', 'Sharp, Roberts and Company', '1838/07', 'Surrey', '1', 'L&BR'], ['2', '2-2-2', 'G. and J. Rennie', '1838/08', 'Croydon', '2', 'SER'], ['3', '2-2-2', 'Sharp, Roberts and Company', '1838/09', 'Sussex', '3', 'L&BR'], ['4', '2-2-2', 'Sharp, Roberts and Company', '1839/02', 'Kent', '4', 'L&BR'], ['5', '2-2-2', 'Sharp, Roberts and Company', '1839/03', 'London', '5', 'SER'], ['6', '2-2-2', 'G. and J. Rennie', '1839/07', 'Archimedes', '6', 'SER'], ['7', '0-4-2', 'Sharp, Roberts and Company', '1839/07', 'Hercules', '7', 'SER']]}