import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int q = a/1000;
		int h = a%1000;
		
		
		if (q<h) {
			System.out.println(h*1000+q);
		}else {
			System.out.println(q*1000+h);
		}
		
	}

}
/**************************************************************
	Problem: 1631
	User: admin
	Language: Java
	Result: Accepted
	Time:718 ms
	Memory:40536 kb
****************************************************************/