using System;

public class Program

{

    public static void Main()

    {

        int num=0;

        long sum=0, temp=1;

        do{

            Console.Write("Enter series number: ");

        }while(!int.TryParse(Console.ReadLine(),out num)||num<0);

        for(int i=1;i<=num;i++){

            Console.Write("{0}",temp);

            sum+=temp;

            if(i<num){Console.Write(" + ");temp*=10;temp++;}

        }

        if(num==0){Console.Write("0");}

        Console.WriteLine(" = {0}",sum);

    }

}