#include<bits/stdc++.h>
using namespace std;
int main(){
    int count=0;
    long long int n;
    long long int arr[10];
    arr[0]=0;
 
    for(int i=1;i<10;i++){
        arr[i]=arr[i-1]+i*((pow(10,i)-1)-pow(10,i-1)+1);
    //  cout<<arr[i]<<endl;
    }
 
    cin>>n;
    long long int temp=n;
    while(temp>0){
        count++;
        temp=temp/10;
    }
    //cout<<count<<endl;
    long long int ans=count*(n-pow(10,count-1)+1)+arr[count-1];
        cout<<ans<<endl;
    return 0;
}

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MTAwMDAwMA==

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