import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner stdIn = new Scanner(System.in);
		int A = stdIn.nextInt();
		int B = stdIn.nextInt();
		int ans1 = 0, ans2 = 0, ans3 = 0;
		int ans = 0;
		ans1 = A + B;
		ans2 = A - B;
		ans3 = A * B;
		if(ans1 >= ans2){
			if(ans1 >= ans3){
				ans = ans1;
			}
		}
		if(ans2 >= ans1){
			if(ans2 >= ans3){
				ans = ans2;
			}
		}
		if(ans3 >= ans1){
			if(ans3 >= ans2){
				ans = ans3;
			}
		}
		System.out.println(ans);
		stdIn.close();
	}
}
/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