import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int y = in.nextInt();

        if(y == 2017) System.out.println(0);
        else System.out.println(2017 - y);

        in.close();
    }
}