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  1. # 0J/QsNGA0YXQvtC80LXQvdC60L4=
  2. def f(n):
  3. if n <= 0:
  4. return 0
  5. elif n == 1:
  6. return 1
  7. else:
  8. a, b = 0, 1
  9. for _ in range (2, n):
  10. c=a+b
  11. a=b
  12. b=c
  13. return b
  14. print(f(20))
  15.  
  16.  
Success #stdin #stdout 0.11s 14192KB
stdin
Standard input is empty
stdout
4181