SELECT count(*) FROM airports AS T1 JOIN routes AS T2 ON T1.apid  =  T2.dst_apid WHERE country  =  'Canada'
How many routes end in a Canadian airport?
[Schema (values) (types)]: | flight_4 |  routes : rid (text) , dst_apid (number) , dst_ap (number) , src_apid (text) , src_ap (number) , alid (text) , airline (number) , codeshare (text) | airports : apid (text) , name (number) , city (number) , country (text) , x (number) , y (text) , elevation (number) , iata (text) , icao (text) | airlines : alid (text) , name (number) , iata (number) , icao (text) , callsign (number) , country (text) , active (number);