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 p =a+b;
		int m =a-b;
		int k = a*b;

		if((p>=m)&&(p>=k)) {
			System.out.println(p);
		}else if((m>=p)&&(m>=k)) {
			System.out.println(m);
		}else if((k>=m)&&(k>=m)) {
			System.out.println(k);
		}

	}

}
/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