import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		StringBuilder sb = new StringBuilder(sc.next());
		sc.close();

		while (sb.length() < 3) {
			sb.insert(0, '0');
		}
		System.out.println(sb.toString());
	}
}