import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        try {
            FileInputStream fileInStreamObj = new FileInputStream("cifra.in");
            InputStream inStreamObject = ((InputStream) fileInStreamObj);
            Scanner sc = new Scanner( inStreamObject );
            
            BufferedWriter writer;
            writer = new BufferedWriter(new FileWriter("cifra.out"));
            String line = sc.nextLine();
            
            writer.write(String.valueOf(0));
            writer.close();
        } catch (IOException ex) {
            System.out.println("");
        }
    }
    
}