#include <conio.h>
#include <stdio.h>
#include <iostream.h>
#include <math.h>

void main(){
	int n, k;

	cout<<"Dati n ";
	cin>>n;
	long int  s=0;
	for(k=1;k<=n;k++){
		
		
		long int putere;
		long int produs;
		putere=pow((double)10,(double)n-k);
		//cout<<putere<<endl;
		produs=putere*k;
		s=s+9*produs+(n+1);
		
	}
	cout<<s<<endl;
	getch();
}