25 lines
334 B
Python
25 lines
334 B
Python
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def problem_p02952(input_data):
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n = int(eval(input_data))
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def countKeta(num):
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count = 1
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while num / 10 >= 1:
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count += 1
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num = num // 10
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return count
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count = 0
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for i in range(1, n + 1):
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if countKeta(i) % 2 == 1:
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count += 1
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return count
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