import java.util.Scanner;

class Main {

	public static void main(String[] args) {
		Scanner ipt = new Scanner(System.in);
		int a = ipt.nextInt(), b = ipt.nextInt(), add, sub, mul;
		add = a + b;
		sub = a - b;
		mul = a * b;
		if (add >= sub)
			if (mul >= add)
				System.out.println(mul);
			else
				System.out.println(add);
		if (sub > add)
			if (mul >= sub)
				System.out.println(mul);
			else
				System.out.println(sub);
	}
}
/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