[백준] 2420번

import java.util.Scanner;

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

      long N = sc.nextLong();
      long M = sc.nextLong();

      long ans = N + (M * -1);
      System.out.println(Math.abs(ans));
   }
}