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- digits=int(input())
- no_digits=1
- last_number=9
- first_number=1
- numbers=0
- pages=0
- while digits>0:
- numbers=last_number-first_number+1
- if digits<numbers*no_digits:
- if digits%no_digits==0:
- pages=pages+digits/no_digits
- else:
- pages=-1
- digits=-1
- else:
- pages=pages+numbers
- digits=digits-numbers*no_digits
- last_number=last_number*10+9
- first_number*=10
- no_digits+=1
- print(pages)
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