import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		String input = scn.nextLine();
		int birthYear = Integer.parseInt(input);
		int age = calcYear(birthYear);
		System.out.println(age);
	}

	public static int calcYear(int birthYear) {

		int age = 2017 - birthYear;

		return age;
	}
}