import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.PrintWriter;
import java.util.Scanner;

public class Digits {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner sc = new Scanner(new FileReader("digits.in"));
		PrintWriter out = new PrintWriter("digits.out");

		int n = sc.nextInt();

		long sum[] = new long[100];
		int cnt[] = new int[100];

		for(int i=1; i<= (int) 1e6; i++) {
			int digs = sumDigs(i);

			if(cnt[digs] < n) {
				cnt[digs]++;
				sum[digs] += i;
			}
		}
		long min = Long.MAX_VALUE;
		for(int i=0; i<sum.length; i++)
			if(cnt[i] == n)
				min = Math.min(min, sum[i]);

		out.println(min);
		out.flush();
		out.close();
	}

	static int sumDigs(int n) {
		int res = 0;
		while(n > 0) {
			res += n % 10;

			n /= 10;
		}

		return res;
	}
}