#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,s=0,k;
	cin>>a;
	s=a;
	k=a;
	for(int i=1;i<=a-1;i++){
		k=k*10+a;
		s=s+k;
	}
	cout<<s;

	return 0;
}

/**************************************************************
	Problem: 1245
	User: wuzhijing
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/