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  1. def a(n): return n
  2. def S(n):
  3. if n == 0: return 1
  4. else: return sum(S(i) for i in range(n)) + a(n)
  5.  
  6. print(S(int(input())))
Success #stdin #stdout 0.02s 9232KB
stdin
5
stdout
47