import java.util.*;

public class pr53 {
	public static void main(String[] args) {
		int n = new Scanner(System.in).nextInt();
		String ans = "1";
		for (int i = 1; i < n; i++) {
			StringBuffer next = new StringBuffer();
			int count = 0;
			char last = ' ';
			for (int j = 0; j < ans.length(); j++) {
				if (last == ans.charAt(j)) {
					count++;
				} else {
					if (count > 0) next.append(count + "" + last);
					count = 1;
					last = ans.charAt(j);
				}
			}
			if (count > 0) next.append(count + "" + last);
			ans = next.reverse().toString();
		}
		System.out.println(ans);
	}
}