#include <iostream>
using namespace std;
int main(){ 
    int n,i,j,s=0,c=0;
    cin>>n;
    for(i=1;i<=n;i++){
        for(j=1;j<=i;j++){
            c=c*10+n;
        }
        s+=c;
        c=0;
    }
    cout<<s<<endl;
}
/**************************************************************
	Problem: 1245
	User: xuanhua
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/