import java.util.*;

class Main {
	public static void main (String[] args) {
		Scanner sc=new Scanner(System.in); 
		String s=sc.next();
		int i=0;
		if(Integer.parseInt(s)<=(s.charAt(i)-'0')*111)
		    System.out.print((s.charAt(i)-'0')*111);
		else
		    System.out.print((s.charAt(i)-'0'+1)*111);
		
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz