import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args)throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        String[] str = line.split(" ");
        int a =Integer.parseInt(str[0]);
        int b =Integer.parseInt(str[1]);
        a *=-1;
        int sum = a-b;
        System.out.println(Math.abs(sum));
	}
}