백준 18108

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main18108 {

	public static void main(String[] args) throws IOException {
		 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	        int y = Integer.parseInt(br.readLine());
	        int c = 2541-1998;
	        
	        System.out.println(y-c);	
		
		
	}

	
}