import java.util.Scanner;

public class Mainxy {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String year = sc.nextLine();
		boolean foundSame = true;
		int currentYear = Integer.parseInt(year) + 1;
		while(foundSame) {
			foundSame = false;
			char[] y = (currentYear + "").toCharArray();
			for(int i = 0; i < y.length; i++) {
				for(int j = i + 1; j < y.length; j++) {
					if(y[i] == y[j]) {
						foundSame = true;
					}
				}
			}
			if(foundSame) currentYear++;
		}
		System.out.println(currentYear);
	}

}