import java.util.Scanner;

class Test {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String str1 = in.next();
		String str2 = in.next();
		long A = Long.parseLong(str1);
		long B = Long.parseLong(str2);
		
		if(A > B) {
			System.out.println(2000000000 - A - B);
		}
		if(A < B) {
			System.out.println(B - A);
		}
	}
}