sum=4+44+444+4444

import java.util.Scanner;class  HomeWork_8{public static void main(String[] args) {Scanner sc=new Scanner(System.in);int x=sc.nextInt();System.out.println(Test1(x));}public static int Test1(int x){int sum=x;int ret=x;for (int i=2;i<=x ;i++ ){ret*=10;ret+=x;sum+=ret;}return sum;}}