#include<stdio.h>
int h(int n,int a){
	int t=0,j;
	for(j=1;j<=a;j++){
		t=t*10+n;
	}
	return t;

}
int main()
{
	int a,i,n=0;
	scanf("%d",&a);
	for(i=1;i<=a;i++){
		n=n+h(a,i);
	}
	printf("%d",n);




return 0;
}

/**************************************************************
	Problem: 1245
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/