import java.util.Scanner;
import java.util.Arrays;
import java.lang.Math;

public class Main {
    public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());

        Integer result;
        Integer total = Integer.sum(a, b);

        if (total > 3) {
            result = Math.abs(a - b);
        } else {
           result = a + b;
        }

        System.out.println(result);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz