import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        int a = A + B,
            b = A - B,
            c = A * B;

        if (a < b) {
            if (b < c) {
                System.out.println(c);
            } else {
                System.out.println(b);
            }
        } else {
            if (a < c) {
                System.out.println(c);
            } else {
                System.out.println(a);
            }
        }
    }
}
/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