import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//次回のABC
		int N = sc.nextInt();
		//桁数ゾロ目にするため
		int x = N/111;
		//割り切れないとき(670など)は
		//次回ゾロ目の時(777)に参加する
        //670/111=6, 6+1=7, 7*111=777
		if(N%111!=0) {
			x+=1;
		}
		System.out.println(111*x);
	}
}

/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