import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		List<Integer> c = new ArrayList<>();
		
		c.add(a + b);
		c.add(a - b);
		c.add(a * b);

		if(c.get(0) <= c.get(1)) {
			if(c.get(1) <= c.get(2)) {
				System.out.println(c.get(2));
				return;
			} else {
				System.out.println(c.get(1));
				return;
			}
		} else {
			if(c.get(0) <= c.get(2)) {
				System.out.println(c.get(2));
				return;
			} else {
				System.out.println(c.get(0));
				return;
			}
		}
	}
}
/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