import java.util.*;
import java.io.*;
import java.math.*;
 
class Main {
 
	public static void main(String[] args) throws IOException{
		Scanner sc = new Scanner(System.in);//new File("input.txt"));
	    PrintWriter pw = new PrintWriter(System.out);//new File("output.txt"));
	    int n = sc.nextInt();
		int x = n;
		int m = 0;
		while (x > 0)
		{
			x /= 10;
			m++;
		}
		long ans = (long)n*m + m - 1;
		long k = 1;
		for (int i = 0; i < m-1; i++)
		{
			k *= 10;
			ans -=k;
		}
		pw.println(ans);
	   pw.close();
	}
}
 

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