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Jan 19th, 2020
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C++ 0.22 KB | None | 0 0
  1. n = int(input())
  2.  
  3. def f(n):
  4.     if n == 1:
  5.         return True
  6.     elif n < 1:
  7.         return False
  8.     elif f(n - 3):
  9.         return True
  10.     elif f(n - 5):
  11.         return True
  12.     else:
  13.         return False
  14.  
  15. if f(n) == 1:
  16.     print('YES')
  17. else:
  18.     print('NO')
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