import java.util.*;
class Main {
	public static void main(String args[]) {
    	Scanner sc = new Scanner(System.in);
      	int[] res = new int[]{111,222,333,444,555,666,777,888,999};
      	int n = sc.nextInt();
      	int i = 0;
      	while(res[i] < n) {
        	i++;
        }
      	System.out.println(String.valueOf(res[i]));
    }
}
/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