<Table> <Tr> <Td> </Td> <Td> 1721--1917 </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> 1721--1917 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="3"> Flag of Russia Lesser coat of arms </Td> </Tr> <Tr> <Td_colspan="3"> Motto "S' nami Bog!" Съ нами Богъ! "God is with us!" </Td> </Tr>

How many countries were in the russian empire