Python Countdown

[john boy]

I am running the following program from the example in "how to think like a computer scientist"
 
def countdown(n):
      if n ==0:
           print "Blastoff!"
      else:
          print n
          countdown (n-1)
 
countdown (1000)
 
When I set "n"= 1000 the program runs in interpreter and stops counting down at 14 instead of running all the way to "Blastoff".  If I set n = 985 it completes the program. If I set n=1200 it runs to 214 and stops.  Why is this program only counting to 986....Anybody have an answer??
I am using Python 2.4.2
 

		
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