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  1. __author__ = 'Zlobober'
  2. n = raw_input()
  3. ans = 1
  4. for x in n:
  5.     ans = 2 * ans + (1 if x == '7' else 0)
  6. print ans - 1
Runtime error #stdin #stdout #stderr 0.01s 7692KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Traceback (most recent call last):
  File "prog.py", line 2, in <module>
EOFError: EOF when reading a line
https://ideone.com/0fX8LQ
language:
Python (cpython 2.7.16)
created:
9 years ago
visibility:
secret

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