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- n=int(input())
- res=0
- base=1
- while(True):
- if n>=(base*(10**base-10**(base-1))):
- res=10**base-1
- n-=(base*(10**base-10**(base-1)))
- base+=1
- else:
- res+=n//base;
- break
- print(res)
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