<Tr> <Td_colspan="1"> April 19 </Td> <Td_colspan="1"> Anaheim Ducks </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> 3--1 </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Calgary Flames </Td> <Td_colspan="1"> Scotiabank Saddledome </Td> <Td_colspan="1"> Recap </Td> <Th> </Th> </Tr> <Tr> <Td_colspan="2"> Patrick Eaves (1)--05: 38 Nate Thompson (2)--06: 46 </Td> <Td_colspan="3"> First period </Td> <Td_colspan="3"> No scoring </Td> </Tr> <Tr> <Td_colspan="2"> No scoring </Td> <Td_colspan="3"> Second period </Td> <Td_colspan="3"> 16: 07--pp--Sean Monahan (4) </Td> </Tr> <Tr> <Td_colspan="2"> Ryan Getzlaf (3)--en--19: 53 </Td> <Td_colspan="3"> Third period </Td> <Td_colspan="3"> No scoring </Td> </Tr>

How many teams are in the nhl playoffs