<Table> <Tr> <Td> First Dynasty </Td> <Td> </Td> <Td> c. 3150--2890 </Td> </Tr> <Tr> <Td> Second Dynasty </Td> <Td> II </Td> <Td> 2890--2686 </Td> </Tr> </Table> <Tr> <Td> First Dynasty </Td> <Td> </Td> <Td> c. 3150--2890 </Td> </Tr> <Tr> <Td> Second Dynasty </Td> <Td> II </Td> <Td> 2890--2686 </Td> </Tr> <Tr> <Td> Old Kingdom (show) <Table> <Tr> <Td> Third Dynasty </Td> <Td> III </Td> <Td> 2686--2613 </Td> </Tr> <Tr> <Td> Fourth Dynasty </Td> <Td> IV </Td> <Td> 2613--2498 </Td> </Tr> <Tr> <Td> Fifth Dynasty </Td> <Td> V </Td> <Td> 2498--2345 </Td> </Tr> <Tr> <Td> Sixth Dynasty </Td> <Td> VI </Td> <Td> 2345--2181 </Td> </Tr> </Table> </Td> </Tr>

How many pharaohs were in the 18th dynasty