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- #include <bits/stdc++.h>
- using namespace std;
- long long Pow(int a, int b)
- {
- long long p=1;
- while(b>0)
- {
- p=p*a;
- b--;
- }
- return p;
- }
- int nrcf(int n)
- {
- int i=0;
- while(n)
- {
- i++;
- n/=10;
- }
- return i;
- }
- int main()
- {
- long long n,nrpag=0,d;
- cin>>n;
- d=abs(n-int(0.99999999999*Pow(10,nrcf(n))));
- for(int i=2; i<=nrcf(n); i++)
- {
- nrpag=i*9*Pow(10,i-1)+nrpag;
- }
- cout<<(nrpag+10)-d*nrcf(n);
- return 0;
- }
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